Jilted and heartbroken, 20-year-old Kinoshita Kazuya turns to Diamond, a Rent-A-Girlfriend app that leads him to a fateful encounter with Mizuhara Chizuru, one of the talents on offer.

The aftermath of the ferry incident signals a clear shift in Kazuya’s feelings. Meanwhile, there’s a conspiracy brewing at the hot springs inn he and his family decide to visit.

Ruka is hellbent on knowing the full story behind Kazuya and Chizuru’s relationship, and once she does she decides to take action.

Mizuhara has lost the key to her apartment and comes to Kazuya for some reason... and she's not the only unexpected visitor!

When Nagomi hears that Chizuru's birthday has already passed, she decides to throw a combined party for both her and Kazuya, and she refuses to take no for an answer!

Kazuya can barely process Ruka's actions when Nagomi decides to drop another bomb on the party.