Rent-A-Girlfriend 21 by Reiji Miyajima

Catch up on the manga before the anime returns! You can rent a girlfriend, but can you buy love? Reeling from a bad breakup, Kazuya rents the beautiful, polite Chizuru for a date. But rock bottom might be so much lower than he thought! Chizuru is much more than the pretty face and sweet demeanor he thought he'd bargained for...

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?