Shounen Ga Otona Ni Natta Natsu 1 -f1dbe270--1-... !full! Online

: A classmate of Ryuuki who becomes involved in the central conflict. Plot Summary

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"Shounen Ga Otona Ni Natta Natsu," or "The Summer a Boy Became an Adult," is an adult manga by Jairou, serialized in Comic MILF