5화: 해치는 조커의 방에서 과거의 기억을 불러일으키는 신비로운 열쇠를 발견한다

Hachi finds a strange key while cleaning Joker's room, which causes Joker to recall the time in his childhood when he met his master, the legendary Phantom Thief Silver Heart, as well as the evil Professor Clover.

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