Kusozako Boukou Oshii-san
The high school freshman Mamoru Kishino was expecting a fateful encounter and he met the pretty girl classmate Koko Oshii, and happened to know her secret. To his surprise, he found out Oshii-san's bladder is super weak...!! To not leak this secret, Kishino swore to protect Oshii-san('s bladder).
(Source: Nihon Bungeisha, translated)
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