diff --git a/core/domain/build.gradle.kts b/core/domain/build.gradle.kts
index 5623df11..b65accdf 100644
--- a/core/domain/build.gradle.kts
+++ b/core/domain/build.gradle.kts
@@ -8,6 +8,8 @@ plugins {
 android.namespace = "club.nito.core.domain"
 
 kotlin {
+    explicitApi()
+
     sourceSets {
         commonMain {
             dependencies {
diff --git a/core/domain/src/androidMain/kotlin/club/nito/core/domain/Platform.android.kt b/core/domain/src/androidMain/kotlin/club/nito/core/domain/Platform.android.kt
deleted file mode 100644
index ba54a21a..00000000
--- a/core/domain/src/androidMain/kotlin/club/nito/core/domain/Platform.android.kt
+++ /dev/null
@@ -1,7 +0,0 @@
-package club.nito.core.domain
-
-class AndroidPlatform : Platform {
-    override val name: String = "Android ${android.os.Build.VERSION.SDK_INT}"
-}
-
-actual fun getPlatform(): Platform = AndroidPlatform()
\ No newline at end of file
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/GetParticipantScheduleListUseCase.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/GetParticipantScheduleListUseCase.kt
index c3c7c378..d1fa5176 100644
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/GetParticipantScheduleListUseCase.kt
+++ b/core/domain/src/commonMain/kotlin/club/nito/core/domain/GetParticipantScheduleListUseCase.kt
@@ -15,11 +15,11 @@ import kotlinx.coroutines.flow.flow
 /**
  * スケジュール一覧を取得するユースケース
  */
-sealed interface GetParticipantScheduleListUseCase {
-    operator fun invoke(): Flow<FetchMultipleContentResult<ParticipantSchedule>>
+public sealed interface GetParticipantScheduleListUseCase {
+    public operator fun invoke(): Flow<FetchMultipleContentResult<ParticipantSchedule>>
 }
 
-class GetParticipantScheduleListExecutor(
+public class GetParticipantScheduleListExecutor(
     private val scheduleRepository: ScheduleRepository,
     private val participantRepository: ParticipantRepository,
     private val userRepository: UserRepository,
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/GetRecentScheduleUseCase.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/GetRecentScheduleUseCase.kt
index cd082be8..8ce9c296 100644
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/GetRecentScheduleUseCase.kt
+++ b/core/domain/src/commonMain/kotlin/club/nito/core/domain/GetRecentScheduleUseCase.kt
@@ -17,11 +17,11 @@ import kotlinx.datetime.Clock
 /**
  * 直近のスケジュールを取得するユースケース
  */
-sealed interface GetRecentScheduleUseCase {
-    operator fun invoke(): Flow<FetchSingleContentResult<ParticipantSchedule>>
+public sealed interface GetRecentScheduleUseCase {
+    public operator fun invoke(): Flow<FetchSingleContentResult<ParticipantSchedule>>
 }
 
-class GetRecentScheduleExecutor(
+public class GetRecentScheduleExecutor(
     private val scheduleRepository: ScheduleRepository,
     private val participantRepository: ParticipantRepository,
     private val userRepository: UserRepository,
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/Greeting.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/Greeting.kt
deleted file mode 100644
index 7e8e272e..00000000
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/Greeting.kt
+++ /dev/null
@@ -1,9 +0,0 @@
-package club.nito.core.domain
-
-class Greeting {
-    private val platform: Platform = getPlatform()
-
-    fun greet(): String {
-        return "Hello, ${platform.name}!"
-    }
-}
\ No newline at end of file
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/ModifyPasswordUseCase.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/ModifyPasswordUseCase.kt
index 89f150b6..887bec10 100644
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/ModifyPasswordUseCase.kt
+++ b/core/domain/src/commonMain/kotlin/club/nito/core/domain/ModifyPasswordUseCase.kt
@@ -8,14 +8,14 @@ import club.nito.core.model.runExecuting
 /**
  * 直近のスケジュールを取得するユースケース
  */
-sealed interface ModifyPasswordUseCase {
-    suspend operator fun invoke(password: String): ExecuteResult<UserInfo>
+public sealed interface ModifyPasswordUseCase {
+    public suspend operator fun invoke(password: String): ExecuteResult<UserInfo>
 }
 
-class ModifyPasswordExecutor(
+public class ModifyPasswordExecutor(
     private val authRepository: AuthRepository,
 ) : ModifyPasswordUseCase {
-    override suspend fun invoke(password: String) = runExecuting {
+    override suspend fun invoke(password: String): ExecuteResult<UserInfo> = runExecuting {
         authRepository.modifyAuthUser(
             email = null,
             password = password,
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/ObserveAuthStatusUseCase.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/ObserveAuthStatusUseCase.kt
index fb640b9d..8685ff40 100644
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/ObserveAuthStatusUseCase.kt
+++ b/core/domain/src/commonMain/kotlin/club/nito/core/domain/ObserveAuthStatusUseCase.kt
@@ -8,11 +8,11 @@ import kotlinx.coroutines.flow.Flow
 /**
  * 認証状態を購読するユースケース
  */
-sealed interface ObserveAuthStatusUseCase {
-    operator fun invoke(): Flow<FetchSingleResult<AuthStatus>>
+public sealed interface ObserveAuthStatusUseCase {
+    public operator fun invoke(): Flow<FetchSingleResult<AuthStatus>>
 }
 
-class ObserveAuthStatusExecutor(
+public class ObserveAuthStatusExecutor(
     private val authRepository: AuthRepository,
 ) : ObserveAuthStatusUseCase {
     override fun invoke(): Flow<FetchSingleResult<AuthStatus>> = authRepository.authStatus
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/ParticipateUseCase.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/ParticipateUseCase.kt
index 03d7c261..345c71a3 100644
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/ParticipateUseCase.kt
+++ b/core/domain/src/commonMain/kotlin/club/nito/core/domain/ParticipateUseCase.kt
@@ -6,11 +6,11 @@ import club.nito.core.model.ExecuteResult
 /**
  * 参加表明するユースケース
  */
-sealed interface ParticipateUseCase {
-    suspend operator fun invoke(scheduleId: String, comment: String): ExecuteResult<Unit>
+public sealed interface ParticipateUseCase {
+    public suspend operator fun invoke(scheduleId: String, comment: String): ExecuteResult<Unit>
 }
 
-class ParticipateExecutor(
+public class ParticipateExecutor(
     private val participantRepository: ParticipantRepository,
 ) : ParticipateUseCase {
     override suspend fun invoke(scheduleId: String, comment: String): ExecuteResult<Unit> {
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/Platform.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/Platform.kt
deleted file mode 100644
index aaf593ff..00000000
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/Platform.kt
+++ /dev/null
@@ -1,7 +0,0 @@
-package club.nito.core.domain
-
-interface Platform {
-    val name: String
-}
-
-expect fun getPlatform(): Platform
\ No newline at end of file
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/SignInUseCase.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/SignInUseCase.kt
index aebc7295..af831999 100644
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/SignInUseCase.kt
+++ b/core/domain/src/commonMain/kotlin/club/nito/core/domain/SignInUseCase.kt
@@ -7,11 +7,11 @@ import club.nito.core.model.runExecuting
 /**
  * 直近のスケジュールを取得するユースケース
  */
-sealed interface SignInUseCase {
-    suspend operator fun invoke(email: String, password: String): ExecuteResult<Unit>
+public sealed interface SignInUseCase {
+    public suspend operator fun invoke(email: String, password: String): ExecuteResult<Unit>
 }
 
-class SignInExecutor(
+public class SignInExecutor(
     private val authRepository: AuthRepository,
 ) : SignInUseCase {
     override suspend fun invoke(email: String, password: String): ExecuteResult<Unit> = runExecuting {
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/SignOutUseCase.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/SignOutUseCase.kt
index 55f36dcf..1ca4bc29 100644
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/SignOutUseCase.kt
+++ b/core/domain/src/commonMain/kotlin/club/nito/core/domain/SignOutUseCase.kt
@@ -7,11 +7,11 @@ import club.nito.core.model.runExecuting
 /**
  * 直近のスケジュールを取得するユースケース
  */
-sealed interface SignOutUseCase {
-    suspend operator fun invoke(): ExecuteResult<Unit>
+public sealed interface SignOutUseCase {
+    public suspend operator fun invoke(): ExecuteResult<Unit>
 }
 
-class SignOutExecutor(
+public class SignOutExecutor(
     private val authRepository: AuthRepository,
 ) : SignOutUseCase {
     override suspend fun invoke(): ExecuteResult<Unit> = runExecuting {
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/di/useCaseModule.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/di/UseCaseModule.kt
similarity index 96%
rename from core/domain/src/commonMain/kotlin/club/nito/core/domain/di/useCaseModule.kt
rename to core/domain/src/commonMain/kotlin/club/nito/core/domain/di/UseCaseModule.kt
index caef27cf..f44c8c52 100644
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/di/useCaseModule.kt
+++ b/core/domain/src/commonMain/kotlin/club/nito/core/domain/di/UseCaseModule.kt
@@ -19,7 +19,7 @@ import org.koin.core.module.dsl.singleOf
 import org.koin.dsl.bind
 import org.koin.dsl.module
 
-val useCaseModule: Module = module {
+public val useCaseModule: Module = module {
     singleOf(::ObserveAuthStatusExecutor) bind ObserveAuthStatusUseCase::class
     singleOf(::SignInExecutor) bind SignInUseCase::class
     singleOf(::ModifyPasswordExecutor) bind ModifyPasswordUseCase::class
diff --git a/core/domain/src/commonMain/kotlin/club/nito/core/domain/model/ParticipantSchedule.kt b/core/domain/src/commonMain/kotlin/club/nito/core/domain/model/ParticipantSchedule.kt
index 14326e9c..216aa14c 100644
--- a/core/domain/src/commonMain/kotlin/club/nito/core/domain/model/ParticipantSchedule.kt
+++ b/core/domain/src/commonMain/kotlin/club/nito/core/domain/model/ParticipantSchedule.kt
@@ -3,7 +3,7 @@ package club.nito.core.domain.model
 import club.nito.core.model.UserProfile
 import kotlinx.datetime.Instant
 
-data class ParticipantSchedule(
+public data class ParticipantSchedule(
     val id: String,
     val scheduledAt: Instant,
     val metAt: Instant,
diff --git a/core/domain/src/iosMain/kotlin/club/nito/core/domain/Platform.ios.kt b/core/domain/src/iosMain/kotlin/club/nito/core/domain/Platform.ios.kt
deleted file mode 100644
index 20db3fae..00000000
--- a/core/domain/src/iosMain/kotlin/club/nito/core/domain/Platform.ios.kt
+++ /dev/null
@@ -1,9 +0,0 @@
-package club.nito.core.domain
-
-import platform.UIKit.UIDevice
-
-class IOSPlatform: Platform {
-    override val name: String = UIDevice.currentDevice.systemName() + " " + UIDevice.currentDevice.systemVersion
-}
-
-actual fun getPlatform(): Platform = IOSPlatform()
\ No newline at end of file