Abbandonato e affranto, il ventenne Kinoshita Kazuya si rivolge a Diamond, un'app Rent-A-Girlfriend che lo porta a un incontro fatale con Mizuhara Chizuru, uno dei talenti in offerta.

Immediatamente dopo aver deciso di non fare più affidamento su appuntamenti finti, Kazuya viene colpito da un triplo smacco di rivelazioni: Chizuru non solo va al suo college, ma vive accanto a lui, e sua nonna sta venendo a trovarla e vuole vederla.

Kazuya ha appena il tempo di affrontare le conseguenze della situazione nel pub prima che la banda parta per un breve viaggio a Izu, dove si imbattono in qualcuno inaspettato.

Il piano di Mami arriva al culmine quando Kazuya decide di mettere in chiaro la storia, con reazioni contrastanti.

Le conseguenze dell'incidente del traghetto segnalano un chiaro cambiamento nei sentimenti di Kazuya. Nel frattempo, c'è una cospirazione in fermento alla locanda delle sorgenti termali che lui e la sua famiglia decidono di visitare.

Dover passare una notte nella stessa stanza con Chizuru fa battere forte il cuore e la mente di Kazuya. Nel frattempo, Kuribayashi Shun ha in serbo una sorpresa...

Mentre Kazuya cerca disperatamente di convincere Ruka a promettere che non rivelerà il suo segreto, lei gli dice il suo.

Il Natale scorre con Kazuya che non incontra Chizuru da secoli e vede qualcosa che non avrebbe mai voluto vedere.

Ruka è determinata a conoscere l'intera storia dietro la relazione tra Kazuya e Chizuru, e una volta che lo fa decide di agire.

Kazuya scopre che Kuribayashi è caduto nelle discariche e cerca di capire come può aiutarlo.

Su richiesta di Chizuru, Kazuya va a fare pratica con Sumi, un'altra ragazza in affitto. Sarà davvero in grado di aiutarla e di stare fuori dai guai mentre è lì?

Chizuru e Mami vanno a un imbarazzante appuntamento di noleggio senza sapere che Kazuya li ha visti insieme. Come può Chizuru gestire questa situazione?

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.

Ruka demands an explanation from Kazuya and Chizuru, and Mini overhears it all going down! What will she do with this information?

With the momentum of the crowdfunding campaign stalling, Kazuya must turn to Mini, who happens to be an expert on the matter!

Mini's earnest appeal makes things awkward. Meanwhile, Umi makes a request in return for retweeting the campaign.

Kazuya and Chizuru end up at a ski resort, finding themselves having to shoot the final scene for the movie all on their own. Chizuru decides she has something to say to Kazuya.

It's Ruka's birthday, and Kazuya has to stay true to his word and grant her anything she desires. But what does she want, really?

Sayuri tags along with Kazuya and Chizuru as they scout out the cinema they'll be screening their movie in, and it brings back memories for her.

With Sayuri's prospects looking bleak, Kazuya pulls off the only thing he can do for Chizuru and her.

Not knowing what to do, Kazuya looks to good old Sumi for advice. She decides to take him on a trip to help clear his mind.

Kazuya decides to rent Chizuru out for an entire day and puts together a date plan to help cheer her up. Will he be successful?

Seeing Chizuru overcome with grief, Kazuya decides to give her an outlet and sees the ensuing moment as a big change in their relationship.