Rent-A-Girlfriend manga volume 21 features story and art by Reiji Miyajima.

Kazuya did it. He finally confessed...sort of. And it’s left his relationship with Mizuhara in a nebulous position. Amidst this confusion, new trouble strikes when Umi, the handsome actor who once took Mizuhara out on a date, invites Kazuya to a party. Umi already suspects she might care more for Kazuya than she lets on. What could he be planning?