【SeaSky/Shirikage】I had to have sex with my cousin who was a cos seller for a reason.

[synopsis].
Keiichi Katakura is in his fifth year of working in the information and communications department of a major corporation.
He is what is called an otaku, and is constantly updating his history of not having a girlfriend.
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A few months later, she begins to live with the Shikura family near her new place of work, which brings her closer to them.
One day, Hasekura Rin, the younger sister of the Shikura sisters, asks him to accompany her to a doujin event where she is a cosplay vendor.