Yoichi is writing his graduation thesis in the library, but while deep in thought, he ends up playing with his nipples. Then Kana, the librarian, sees this and touches his nipples out of curiosity... Amused by his overly sensitive reaction, Kana could no longer resist and relentlessly tortured his nipples, bringing him to climax. After that, he secretly plays with her nipples over and over again, and she cums.