By chance, Sato spends a sexy holiday with two female friends. They promise to spend another sexy holiday together but behind the scenes, each of them seduces him individually and he's struggling to decide whose house to go to... Then, one Friday night... He joins a coworker for a drink, only to listen to him complain and misses the last train. His phone is chock-full of messages from Hashimoto. He plans to ignore them and take a taxi home but accidentally marks them as read. When she finds out he's noticed, she forcefully invites him over for a drink at her house...?! Hashimoto is just a friend, so they've had drinks and sleepovers many times. So today was going to be uneventful with a few drinks and a sleepover but... she seems a little closer than usual...! But since it's just Hashimoto, it shouldn't be erotic...! A sleepover with his female friend Hashimoto begins, where "we're just friends, so nothing erotic happens"...?! Starting on Friday night, he spends his holiday with Hashimoto in a completely non-erotic (?!) way.