Japanese Jump Comics volumes carry extras the weekly magazine does not. Printed so far on this site’s radar: Genichi Sojo’s Bathhouse Quest in two parts, and Soya Sazanami’s Memories, Begone! The oneshots page already walks those jokes. This page is the category: jackets, extras, and the red-to-black spine bar are why the tankōbon is a different object from Sunday’s chapter.
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We do not host extras. Color leads in the magazine do not always reprint. If a later volume adds a new omake, it belongs here and on the volume guide. Profile facts harvested from extras and can badges sit on profiles. See bathhouse and extras, volume guide, collectibles.