Thanks to Tsukami and Idabashi, Mayumura’s overcome his awkwardness around girls… and thanks to Mayumura, Tsukami and Idabashi haven’t had to worry about being chilly in the library! Their mutually beneficial relationship continues in secret… until one day they’re confronted by the quiet Hayakawa, who wants some of what Mayumura has for herself! And she has something to offer in return: while she may be taciturn on the outside, she’s actually got a secret sexy social media account where she posts her nude selfies for all to see! Tsukami and Idabashi are ready to accept Hayakawa into their FWB group and transform their threesome into a foursome… so long as she and Mayumura sample their bodily compatibility first!