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The older sister of Nobuhiko, who is not only a university student but also a stunning beauty and a true genius. Despite her exceptional abilities, Mari struggles with socializing and has only a few close friends. When she unexpectedly swaps bodies with Nobuhiko's girlfriend at the beginning of the story, she approaches the situation with calm mind and tries to investigate the cause.

It is revealed that the initial body swap between Mari and Nobuhiko's girlfriend occurred a decade ago. Deeply in love with her brother, Mari once confessed her feelings, but he turned her down due to their sibling relationship. Longing for a chance to be with him, Mari made a heartfelt wish to become someone else. As a result, for ten years, the cheerful literary girl known as "Matsuri" is in fact the true Mari. On the other hand, the enigmatic scientist known as "Mari" is the one inhabiting Nobuhiko's girlfriend's body.