diff --git a/SVSim.EmulatedEntrypoint/Controllers/AdminController.cs b/SVSim.EmulatedEntrypoint/Controllers/AdminController.cs
index 1bee862c..254e7974 100644
--- a/SVSim.EmulatedEntrypoint/Controllers/AdminController.cs
+++ b/SVSim.EmulatedEntrypoint/Controllers/AdminController.cs
@@ -10,6 +10,7 @@ using SVSim.EmulatedEntrypoint.Extensions;
 using SVSim.EmulatedEntrypoint.Infrastructure;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Admin;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Admin;
+using SVSim.EmulatedEntrypoint.Services;
 
 namespace SVSim.EmulatedEntrypoint.Controllers;
 
@@ -79,6 +80,7 @@ public class AdminController : SVSimController
             .Include(v => v.Info).ThenInclude(i => i.SelectedDegree)
             .Include(v => v.Currency)
             .Include(v => v.MissionData)
+            .Include(v => v.Missions)
             .Include(v => v.Classes).ThenInclude(c => c.Class)
             .Include(v => v.Sleeves)
             .Include(v => v.Emblems)
@@ -265,6 +267,60 @@ public class AdminController : SVSimController
                 viewer.MissionData.MissionChangeTime = DateTimeOffset.FromUnixTimeSeconds(mct).UtcDateTime;
         }
 
+        // Pass B: Missions + ViewerEventCounter
+        var skippedMissionIds = new HashSet<int>();
+        var skippedMissionCounterIds = new HashSet<int>();
+        if (request.Missions is { } missions)
+        {
+            viewer.Missions.Clear();
+            var missionIds = missions.Select(m => m.MissionId).Distinct().ToList();
+            var catalogs = await _dbContext.MissionCatalog
+                .Where(c => missionIds.Contains(c.Id))
+                .ToDictionaryAsync(c => c.Id);
+            var nowUtc = DateTimeOffset.UtcNow;
+
+            foreach (var m in missions)
+            {
+                if (!catalogs.TryGetValue(m.MissionId, out var cat))
+                {
+                    skippedMissionIds.Add(m.MissionId);
+                    continue;
+                }
+                viewer.Missions.Add(new ViewerMission
+                {
+                    MissionCatalogId = cat.Id,
+                    Slot = cat.LotType == 6 ? 0 : 1,
+                    MissionStatus = m.MissionStatus,
+                    AssignedAt = DateTimeOffset.UtcNow.ToUnixTimeSeconds(),
+                    ClaimedAt = null
+                });
+
+                var resolved = ResolveMissionCounter(cat, nowUtc);
+                if (resolved is null)
+                {
+                    skippedMissionCounterIds.Add(m.MissionId);
+                    continue;
+                }
+                var (eventKey, period) = resolved.Value;
+                var existingCounter = await _dbContext.ViewerEventCounters
+                    .FirstOrDefaultAsync(c => c.ViewerId == viewer.Id && c.EventKey == eventKey && c.Period == period);
+                if (existingCounter is null)
+                {
+                    _dbContext.ViewerEventCounters.Add(new ViewerEventCounter
+                    {
+                        ViewerId = viewer.Id,
+                        EventKey = eventKey,
+                        Period = period,
+                        Count = m.TotalCount
+                    });
+                }
+                else
+                {
+                    existingCounter.Count = m.TotalCount;
+                }
+            }
+        }
+
         await _dbContext.SaveChangesAsync();
 
         if (skippedCardIds.Count > 0)
@@ -275,6 +331,20 @@ public class AdminController : SVSimController
                 request.SteamId, viewer.Id, skippedCardIds.Count,
                 string.Join(", ", skippedCardIds.Take(20)));
         }
+        if (skippedMissionIds.Count > 0)
+        {
+            _logger.LogWarning(
+                "ImportViewer (steam_id={SteamId}, viewer_id={ViewerId}): skipped {Count} unknown mission_id(s). Sample: [{Sample}]",
+                request.SteamId, viewer.Id, skippedMissionIds.Count,
+                string.Join(", ", skippedMissionIds.Take(10)));
+        }
+        if (skippedMissionCounterIds.Count > 0)
+        {
+            _logger.LogWarning(
+                "ImportViewer (steam_id={SteamId}, viewer_id={ViewerId}): {Count} mission(s) had unresolvable EventKey, counter not written. Sample: [{Sample}]",
+                request.SteamId, viewer.Id, skippedMissionCounterIds.Count,
+                string.Join(", ", skippedMissionCounterIds.Take(10)));
+        }
 
         return new ImportViewerResponse
         {
@@ -282,6 +352,8 @@ public class AdminController : SVSimController
             ShortUdid = viewer.ShortUdid,
             WasCreated = wasCreated,
             SkippedCardCount = skippedCardIds.Count,
+            SkippedMissionCount = skippedMissionIds.Count,
+            SkippedMissionCounterCount = skippedMissionCounterIds.Count,
         };
     }
 
@@ -300,6 +372,20 @@ public class AdminController : SVSimController
         owned.AddRange(rows);
     }
 
+    // TODO: unify with MissionAssembler.cs — same logic duplicated here.
+    private static (string EventKey, string Period)? ResolveMissionCounter(MissionCatalogEntry catalog, DateTimeOffset nowUtc)
+    {
+        if (string.IsNullOrEmpty(catalog.EventType)) return null;
+        var period = catalog.LotType switch
+        {
+            6 => JstPeriod.DayKey(nowUtc),
+            2 => JstPeriod.WeekKey(nowUtc),
+            _ => null
+        };
+        if (period is null) return null;
+        return (catalog.EventType!, period);
+    }
+
     /// <summary>
     /// Fallback sleeve id used when an imported deck has no resolvable <c>sleeve_id</c>.
     /// 3000011 is prod's default deck sleeve.
diff --git a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Admin/ImportViewerRequest.cs b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Admin/ImportViewerRequest.cs
index 340ec114..3f3a2bfa 100644
--- a/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Admin/ImportViewerRequest.cs
+++ b/SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Admin/ImportViewerRequest.cs
@@ -35,6 +35,8 @@ public class ImportViewerRequest
     [JsonPropertyName("decks")] public List<ImportDeck>? Decks { get; set; }
 
     [JsonPropertyName("mission_meta")] public ImportMissionMeta? MissionMeta { get; set; }
+
+    [JsonPropertyName("missions")] public List<ImportMission>? Missions { get; set; }
 }
 
 public class ImportDeck
@@ -81,6 +83,18 @@ public class ImportItem
     [JsonPropertyName("count")]   public int Count { get; set; }
 }
 
+public class ImportMission
+{
+    [JsonPropertyName("mission_id")]
+    public int MissionId { get; set; }
+
+    [JsonPropertyName("mission_status")]
+    public int MissionStatus { get; set; }
+
+    [JsonPropertyName("total_count")]
+    public int TotalCount { get; set; }
+}
+
 public class ImportMissionMeta
 {
     [JsonPropertyName("has_received_pick_two_mission")]
diff --git a/SVSim.UnitTests/Controllers/AdminControllerTests.cs b/SVSim.UnitTests/Controllers/AdminControllerTests.cs
index b8051d7d..8476344a 100644
--- a/SVSim.UnitTests/Controllers/AdminControllerTests.cs
+++ b/SVSim.UnitTests/Controllers/AdminControllerTests.cs
@@ -5,6 +5,7 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using SVSim.Database;
 using SVSim.Database.Enums;
+using SVSim.Database.Models;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Admin;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Admin;
 using SVSim.UnitTests.Infrastructure;
@@ -484,4 +485,104 @@ public class AdminControllerTests
         Assert.That(viewer.MissionData.MissionChangeTime,
             Is.EqualTo(DateTimeOffset.FromUnixTimeSeconds(1_700_000_000L).UtcDateTime));
     }
+
+    [Test]
+    public async Task ImportViewer_Missions_RoundTripsWithCounter()
+    {
+        using var factory = new SVSimTestFactory();
+        using (var seedScope = factory.Services.CreateScope())
+        {
+            var db = seedScope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+            db.MissionCatalog.Add(new MissionCatalogEntry
+            {
+                Id = 9001, LotType = 6 /* daily */,
+                EventType = "battle_win_total", EventArg = null
+            });
+            await db.SaveChangesAsync();
+        }
+        var client = factory.CreateClient();
+        ulong steamId = 70000000000000002UL;
+
+        var resp = await client.PostAsJsonAsync("/admin/import_viewer", new ImportViewerRequest
+        {
+            SteamId = steamId,
+            Missions = new List<ImportMission>
+            {
+                new() { MissionId = 9001, MissionStatus = 1, TotalCount = 7 }
+            }
+        });
+        resp.EnsureSuccessStatusCode();
+        var body = await resp.Content.ReadFromJsonAsync<ImportViewerResponse>(JsonOptions);
+        Assert.That(body!.SkippedMissionCount, Is.EqualTo(0));
+        Assert.That(body.SkippedMissionCounterCount, Is.EqualTo(0));
+
+        using var scope = factory.Services.CreateScope();
+        var verifyDb = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        var viewerId = await verifyDb.Viewers
+            .Where(v => v.SocialAccountConnections
+                .Any(s => s.AccountType == SocialAccountType.Steam && s.AccountId == steamId))
+            .Select(v => v.Id).SingleAsync();
+        Assert.That(verifyDb.ViewerMissions.Count(m => m.ViewerId == viewerId && m.MissionCatalogId == 9001), Is.EqualTo(1));
+        Assert.That(verifyDb.ViewerEventCounters
+            .Count(c => c.ViewerId == viewerId && c.EventKey == "battle_win_total" && c.Count == 7), Is.EqualTo(1));
+    }
+
+    [Test]
+    public async Task ImportViewer_Missions_UnknownMissionIdSkipped()
+    {
+        using var factory = new SVSimTestFactory();
+        var client = factory.CreateClient();
+        ulong steamId = 70000000000000003UL;
+
+        var resp = await client.PostAsJsonAsync("/admin/import_viewer", new ImportViewerRequest
+        {
+            SteamId = steamId,
+            Missions = new List<ImportMission>
+            {
+                new() { MissionId = 999999, MissionStatus = 1, TotalCount = 3 }
+            }
+        });
+        resp.EnsureSuccessStatusCode();
+        var body = await resp.Content.ReadFromJsonAsync<ImportViewerResponse>(JsonOptions);
+        Assert.That(body!.SkippedMissionCount, Is.EqualTo(1));
+
+        using var scope = factory.Services.CreateScope();
+        var verifyDb2 = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        Assert.That(verifyDb2.ViewerMissions.Any(), Is.False);
+    }
+
+    [Test]
+    public async Task ImportViewer_Missions_CatalogPresentButCounterUnresolvable()
+    {
+        using var factory = new SVSimTestFactory();
+        using (var seedScope = factory.Services.CreateScope())
+        {
+            var seedDb = seedScope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+            seedDb.MissionCatalog.Add(new MissionCatalogEntry
+            {
+                Id = 9002, LotType = 6,
+                EventType = null /* unresolvable */, EventArg = null
+            });
+            await seedDb.SaveChangesAsync();
+        }
+        var client = factory.CreateClient();
+        ulong steamId = 70000000000000004UL;
+
+        var resp = await client.PostAsJsonAsync("/admin/import_viewer", new ImportViewerRequest
+        {
+            SteamId = steamId,
+            Missions = new List<ImportMission>
+            {
+                new() { MissionId = 9002, MissionStatus = 1, TotalCount = 5 }
+            }
+        });
+        var body = await resp.Content.ReadFromJsonAsync<ImportViewerResponse>(JsonOptions);
+        Assert.That(body!.SkippedMissionCount, Is.EqualTo(0));
+        Assert.That(body.SkippedMissionCounterCount, Is.EqualTo(1));
+
+        using var scope = factory.Services.CreateScope();
+        var verifyDb3 = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        Assert.That(verifyDb3.ViewerMissions.Count(m => m.MissionCatalogId == 9002), Is.EqualTo(1));
+        Assert.That(verifyDb3.ViewerEventCounters.Any(), Is.False);
+    }
 }