Rent-A-Girlfriend Season 2 - What We Know So Far
An official plot synopsis of "Rent-a-Girlfriend" Season 2 hasn't been announced yet. However, the first season didn't really veer off from its manga roots, following the first six volumes rather closely. And since the manga currently has close to 190 chapters and 19 volumes, with no word on an ending yet, there is actually a lot that the new season could pull from.
The final episode of Season 1 ended with quite a few interesting events. Mami actually rented Chizuru and then confronted her about Kazuya, revealing that she knew the true nature of her and Kazuya's relationship. However, Chizuru denied this, saying that Kazuya was really her boyfriend. She then asked Mami if she ever thought of Kazuya as the true love of her life, which didn't elicit much of a response. Later, Kazuya meets with Chizuru and sort of confesses that he wants her as a girlfriend, but backtracks a bit by saying that he meant as a rental girlfriend.
Season 2 is likely to further explore these developments between Kazuya, Chizuru, and Mami. And while the first season kept teasing these characters' true feelings, the second season is likely to give more opportunities for their actual romantic feelings to really push through.