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Amamiya Souji's tombstone will be engraved with the following achievements: A noble bad actor. Lovers with idols. Master of shoe and sock design. Ex-Girlfriend Avenger.

"On August 19, 2022, Tokyo's legendary artist Miura Gensuke crashed into the sea in a private helicopter, and his remains have not been found so far." Two years later, when Miura Gensuke was enjoying a slow life, an idol lady in mourning clothes came to his office: "Mr. Detective, I want to find a body."

It is impossible for humans to become young. But Gensuke Miura, a high school student detective who was reincarnated in Tokyo, discovered that something was wrong with his classmate Mio Asano. Her body is infantilizing at an extremely fast rate, and there is even a risk of turning into a baby or even disappearing. All this seems to be related to the increasingly frequent mysterious phenomena in Tokyo. After being exposed about her physical changes, Asano Mio made a strange request to Miura Gensuke after school. From then on, Miura Gensuke's life gradually went off track... Remember, in today's Tokyo life, everything that's normal is abnormal.