"Ikken Rakuchaku Goyoujin" (一件落着ゴ用心, Case Closed, Be Careful) is a song by Japanese voice actress idol unit Earphones.

[1] The song has spoken verses narrated by Akira Kushida.

Ikken Rakuchaku Goyoujin and single's B-side, Utopia Monogatari were featured on their 2nd studio album, Some Dreams.

[2] The music video for "Ikken Rakuchaku Goyoujin" was directed by Pink ja Nakutemo.

[3][4] The video features Earphones performed with light stick and background of Akihabara.