Yuri mousou shiteita joshi-tachi no aida ni masaka watashi ga hasamareru nante... Oshi couple ni W koakuma hasamiguchi de monzetsu rezu-iki saserareru mousou rezu harem – Miyu Aizawa × Karin Kitaoka × Shiori Yorimoto.

Miyu, a quiet, inconspicuous literature girl in her class, is a fujoshi otaku whose hobby is fantasizing about yuri pairings among her female classmates. Her favorite pairing is "KariShio" (a name she gave them), the childhood couple of Karin Kitaoka and Shiori Yorimoto, and she would get ecstatic watching them fool around. While this was just Miyu's fantasy hobby, one day, while stalking the two around school as usual, she witnesses Karin and Shiori kissing... and before she knows it, she's sandwiched between the two beautiful girls she admires! A dream lesbian harem where fantasy becomes reality!