Joe Asagiri, creator of the 『3日間シリーズ』 "3-Nichikan Series" (JAV) makes his entrance into the world of hentai manga! A striking debut in a tag-team collaboration with the mangaka Hiroshi Arino!

Hajime is a college student who's practically cohabitating with his girlfriend Rio, who he spends most nights with.
One day, due to a strange turn of events, Rio's best friend Yuri is confirmed by him to be the AV actress Yura Kanou.
Excited by the thought that an AV actress is sleeping right next to him, Hajime ends up being unable to hold back...

(Source: DMM)

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[Note: This has 2 near-identical versions, one is a heavily censored softcore version and the hardcore version marked R-18 has black bars. The covers are slightly different but the story is the same.]

Note:
Based on a JAV: SSNI-623