diff --git a/src/main/scala/com/s10myk4/adapter/http/controller/WarriorEitherController.scala b/src/main/scala/com/s10myk4/adapter/http/controller/WarriorEitherController.scala
new file mode 100644
index 0000000..56a7a6d
--- /dev/null
+++ b/src/main/scala/com/s10myk4/adapter/http/controller/WarriorEitherController.scala
@@ -0,0 +1,34 @@
+package com.s10myk4.adapter.http.controller
+
+import cats.data.EitherT
+import cats.effect.IO
+import com.s10myk4.adapter.http.controller.support.{ActionSupport, FormHelper}
+import com.s10myk4.adapter.http.form.EquipWeaponForm
+import com.s10myk4.application.usecase._
+import com.s10myk4.domain.model.character.warrior.WarriorId
+import play.api.mvc._
+
+import scala.concurrent.ExecutionContext
+
+final class WarriorEitherController(
+    cc: ControllerComponents,
+    findWarrior: FindWarriorEither[IO],
+    warriorEquippedNewWeapon: EquipWeaponToWarriorEither[IO],
+    presenter: Presenter[UseCaseResult, Result],
+    val ec: ExecutionContext
+) extends AbstractController(cc)
+    with FormHelper
+    with ActionSupport {
+
+  def equipWeapon(id: Long): EssentialAction = Action.async { implicit r =>
+    (for {
+      form <- EitherT(EquipWeaponForm.apply.bindEither[IO])
+      (warriorId, weapon) = (WarriorId(id), form.weapon)
+      warrior <- EitherT(findWarrior.exec(warriorId))
+      result  <- EitherT(warriorEquippedNewWeapon.exec(warrior, weapon))
+    } yield result)
+      .fold(abnormal => presenter.present(abnormal), normal => presenter.present(normal))
+      .toFuture
+  }
+
+}
diff --git a/src/main/scala/com/s10myk4/adapter/http/controller/support/FormHelper.scala b/src/main/scala/com/s10myk4/adapter/http/controller/support/FormHelper.scala
index 583caee..deaf1e3 100644
--- a/src/main/scala/com/s10myk4/adapter/http/controller/support/FormHelper.scala
+++ b/src/main/scala/com/s10myk4/adapter/http/controller/support/FormHelper.scala
@@ -20,6 +20,13 @@ private[http] trait FormHelper {
             a => f(a)
           )
       )
+
+    def bindEither[F[_]: Applicative](implicit req: Request[AnyContent]): F[Either[InvalidInputParameters, A]] = {
+      form.bindFromRequest.fold(
+        error => Applicative[F].pure(Left(InvalidInputParameters(errors = convertFormErrorsToMap(error.errors)))),
+        a => Applicative[F].pure(Right(a))
+      )
+    }
   }
 
   private def convertFormErrorsToMap(errors: Seq[FormError]): Map[String, String] = {
diff --git a/src/main/scala/com/s10myk4/application/usecase/EquipWeaponToWarrior.scala b/src/main/scala/com/s10myk4/application/usecase/EquipWeaponToWarrior.scala
index c3a681e..4ed5c9e 100644
--- a/src/main/scala/com/s10myk4/application/usecase/EquipWeaponToWarrior.scala
+++ b/src/main/scala/com/s10myk4/application/usecase/EquipWeaponToWarrior.scala
@@ -34,7 +34,7 @@ object EquipWeaponToWarrior {
       weapon: Weapon
   )
 
-  private implicit def toUseCaseResult(domainErrors: NonEmptyList[WarriorError]): UseCaseResult = {
+  implicit def toUseCaseResult(domainErrors: NonEmptyList[WarriorError]): AbnormalCase = {
     val errors = domainErrors.toList.toSet
     errors match {
       case _ if errors == Set(DifferentAttributeError, NotOverLevelError) => DifferentAttributeAndNotOverLevel
diff --git a/src/main/scala/com/s10myk4/application/usecase/EquipWeaponToWarriorEither.scala b/src/main/scala/com/s10myk4/application/usecase/EquipWeaponToWarriorEither.scala
new file mode 100644
index 0000000..c759c93
--- /dev/null
+++ b/src/main/scala/com/s10myk4/application/usecase/EquipWeaponToWarriorEither.scala
@@ -0,0 +1,35 @@
+package com.s10myk4.application.usecase
+
+import cats.Monad
+import cats.data.EitherT
+import cats.data.Validated.{Invalid, Valid}
+import cats.syntax.functor._
+import com.s10myk4.domain.lifcycle.WarriorRepository
+import com.s10myk4.domain.model.character.warrior.Warrior
+import com.s10myk4.domain.model.weapon.Weapon
+
+import scala.language.higherKinds
+
+final class EquipWeaponToWarriorEither[F[_]: Monad](
+    repository: WarriorRepository[F]
+) {
+
+  import EquipWeaponToWarrior._
+
+  def exec(warrior: Warrior, newWeapon: Weapon): F[Either[AbnormalCase, NormalCase.type]] = {
+    warrior.equip(newWeapon) match {
+      case Valid(w)     => repository.update(w).map(_ => Right(NormalCase))
+      case Invalid(err) => Monad[F].point(Left(err))
+    }
+  }
+
+  def hoge(warrior: Warrior, newWeapon: Weapon): EitherT[F, AbnormalCase, NormalCase.type] = {
+    warrior.equip(newWeapon) match {
+      case Valid(w) =>
+        EitherT.right[AbnormalCase](repository.update(w).map(_ => NormalCase))
+      case Invalid(err) =>
+        EitherT.left[NormalCase.type](Monad[F].pure(toUseCaseResult(err)))
+    }
+  }
+
+}
diff --git a/src/main/scala/com/s10myk4/application/usecase/FindWarriorEither.scala b/src/main/scala/com/s10myk4/application/usecase/FindWarriorEither.scala
new file mode 100644
index 0000000..c7717d6
--- /dev/null
+++ b/src/main/scala/com/s10myk4/application/usecase/FindWarriorEither.scala
@@ -0,0 +1,22 @@
+package com.s10myk4.application.usecase
+
+import cats.Monad
+import cats.syntax.functor._
+import com.s10myk4.application.usecase.FindWarrior.WarriorNotFound
+import com.s10myk4.domain.lifcycle.WarriorRepository
+import com.s10myk4.domain.model.character.warrior.{Warrior, WarriorId}
+
+import scala.language.higherKinds
+
+final class FindWarriorEither[F[_]: Monad](
+    repository: WarriorRepository[F]
+) {
+
+  def exec(id: WarriorId): F[Either[AbnormalCase, Warrior]] = {
+    repository.resolveBy(id).map {
+      case Some(w) => Right(w)
+      case None    => Left(WarriorNotFound)
+    }
+  }
+
+}
diff --git a/src/test/scala/com/s10myk4/application/support/EitherTComposeSpec.scala b/src/test/scala/com/s10myk4/application/support/EitherTComposeSpec.scala
new file mode 100644
index 0000000..70c595a
--- /dev/null
+++ b/src/test/scala/com/s10myk4/application/support/EitherTComposeSpec.scala
@@ -0,0 +1,23 @@
+package com.s10myk4.application.support
+
+import cats.data.EitherT
+import cats.effect.IO
+import org.scalatest.FlatSpec
+
+class EitherTComposeSpec extends FlatSpec {
+
+  it should "EitherT" in {
+    val res = for {
+      a <- EitherT[IO, String, String](IO(Right("a")))
+      b <- EitherT[IO, String, String](IO(Left("break")))
+      c <- EitherT[IO, String, String](IO(Right("c")))
+    } yield a + b + c
+    res
+      .fold(
+        left => assert(left == "break"),
+        _ => false
+      )
+      .unsafeRunSync()
+  }
+
+}
diff --git a/src/test/scala/com/s10myk4/application/support/UseCaseContSpec.scala b/src/test/scala/com/s10myk4/application/support/UseCaseContSpec.scala
index d6ccf9a..765e0b0 100644
--- a/src/test/scala/com/s10myk4/application/support/UseCaseContSpec.scala
+++ b/src/test/scala/com/s10myk4/application/support/UseCaseContSpec.scala
@@ -22,9 +22,11 @@ class UseCaseContSpec extends FlatSpec {
   it should "処理途中で異常系が発生した場合に処理を打ち切る" in {
     val res = for {
       a <- ContT[IO, String, String](f => f("a"))
-      b <- ContT[IO, String, String](_ => IO.raiseError(new Exception("b")))
-      c <- ContT[IO, String, String](f => f("c"))
-    } yield a + b + c
-    assertThrows[Exception](res.run(Applicative[IO].pure).unsafeRunSync())
+      b <- ContT[IO, String, String](f => f("b"))
+      c <- ContT[IO, String, String](_ => IO("break"))
+      d <- ContT[IO, String, String](f => f("d"))
+    } yield a + b + c + d
+    res.run(Applicative[IO].pure).map(r => assert(r == "break")).unsafeRunSync()
   }
+
 }