diff --git a/src/main/kotlin/net/hareworks/hcu/items/domain/impl/GrapplingItem.kt b/src/main/kotlin/net/hareworks/hcu/items/domain/impl/GrapplingItem.kt
index 6f92bfa..7d2522d 100644
--- a/src/main/kotlin/net/hareworks/hcu/items/domain/impl/GrapplingItem.kt
+++ b/src/main/kotlin/net/hareworks/hcu/items/domain/impl/GrapplingItem.kt
@@ -58,6 +58,8 @@ class GrapplingItem : SpecialItem("grappling_hook") {
             val speed = 1.0 + (tier.level * 0.4) 
             
             val velocity = vector.normalize().multiply(speed)
+            // 垂直方向の速度を抑制（上方向に飛びすぎるのを防ぐ）
+            velocity.y = velocity.y * 0.5
             player.velocity = velocity
             
 
@@ -110,7 +112,8 @@ class GrapplingItem : SpecialItem("grappling_hook") {
         val shooter = projectile.shooter
         
         if (shooter is org.bukkit.entity.Player) {
-            projectile.velocity = projectile.velocity.add(shooter.velocity)
+            // フックの飛行速度を上げる（1.8倍）+ プレイヤーの移動速度を加算
+            projectile.velocity = projectile.velocity.multiply(1.8).add(shooter.velocity)
             
             shooter.playSound(shooter.location, org.bukkit.Sound.ENTITY_FISHING_BOBBER_THROW, 1.0f, 0.8f)
             shooter.playSound(shooter.location, org.bukkit.Sound.ENTITY_ARROW_SHOOT, 0.5f, 1.2f)