During a quiet moment, Chizuru notices several Shinsengumi officers meeting in secret—and Hijikata instructs her to report back anything she learns. Eavesdropping, she discovers that Itou has lost something precious and is desperately trying to recover it before anyone else finds it. When Chizuru locates the box and opens it, something goes very wrong: everyone present is instantly transformed into chibi versions of themselves. Returning to normal requires completing a series of mini-games, each one more improbable than the last.