240906 Shounen Ga Otona Ni Natta Natsu Vol1 Exclusive -

The story is described as a pornographic reimagining of The Strange Case of Dr. Jekyll and Mr. Hyde . Reiko, the proper and studious sister, uses her scientific knowledge to create the carefree Kiriru persona as an outlet for her repressed desires.

The MyAnimeList Profile for Shounen ga Otona ni Natta Natsu documents the title's official adaptation into the OVA (Original Video Animation) space. 240906 shounen ga otona ni natta natsu vol1 exclusive