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.

Immediately after deciding not to rely on pretend dating anymore, Kazuya is hit with a triple whammy of reveals: Chizuru not only goes to his college but lives next door to him, and his grandmother is coming to visit and wants to see her.

Kazuya barely has time to deal with the fallout of the situation in the pub before the gang heads off on a short trip to Izu, where they run into someone unexpected.

Mami’s plan comes to a head as Kazuya decides to set the story straight, to mixed reactions.

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.

Having to spend a night in the same room with Chizuru sends Kazuya’s heart and mind racing. Meanwhile, Kuribayashi Shun has a surprise in store…

While Kazuya desperately tries to get Ruka to promise she won’t reveal his secret, she tells him her own.

Christmas rolls around with Kazuya not having met Chizuru for ages, and he sees something he never wanted to see.

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

Kazuya learns that Kuribayashi's been down in the dumps and tries to figure out how he can help him.

On Chizuru's request, Kazuya goes on a practice date with Sumi, another rental girlfriend. Will he actually be able to help her and stay out of trouble while he's at it?

Chizuru and Mami go on an awkward rental date unaware that Kazuya has seen them together. How can Chizuru handle this situation?

As Mizuhara looks set to quit the rental girlfriend business, Kazuya goes to watch a play, one that could be pivotal to their relationship.

As the fallout from the play becomes clear, things go back to normal between Mizuhara and Kazuya, until...?

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

Kazuya has barely dealt with the aftermath of Mami's visit when he gets another aggressive visitor!

Kazuya tries to clear the misunderstanding Chizuru is under, all while enlisting Sumi's help to get her a fitting birthday present.

As Kazuya wonders if his birthday gift was good enough, he and Chizuru find themselves in a crisis in the form of a boozer.

Kazuya wakes up with the worst hangover ever and struggles with his fragmented memories. Meanwhile, someone finds out about his workplace and decides to make an appearance.

Kazuya decides to spend his all-day date with Mizuhara reclaiming his lost youth... in a very peculiar fashion.

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.

Kazuya has hardly begun to process the fallout from his birthday when he gets asked to go on another practice date with Sumi, this time with her taking the lead!

Chizuru reflects on her journey to get her here, and Kazuya acts on his idea to help her.

Kazuya and Chizuru have decided to make a movie together so that Granny Sayuri can see it. That's all well and good, but now they have to sit down and work out all the details.