Eps.1 Second year high school student Kurihara Yuki (Kurihara-san) falls in love at first sight with Momotsuki Shinya (Momo-kun), a boy one year her junior, and confesses her feelings to him. They begin dating, but Momokuri-san is actually a slightly (?) unusual girl who already knows everything there is to know about Momo-kun! Eps.2 Though Momo-kun and Kurihara-san have officially begun dating, Kurihara-san is still up to her usual antics such as lying in wait for Momo-kun and holding onto his straws after he's finished using them. While she finds her behavior exasperating, her friend Mizuyama Norika warmly watches over her. Meanwhile, Momo-kun begins to grow curious over Kurihara-san's strange words and behavior...

Eps.3 When Kurihara-san asks Momo-kun out on a date, she is excited to see Momo-kun dressed in the casual clothes she doesn't get to see at school and learn new things about him. Then Momo-kun has his first birthday since the couple has begun dating. Kurihara-san does her best to create a homemade present for him, but... Eps.4 Kurihara-san invites Momo-kun's classmates Rihito and Shota and Kurihara-san's friend Norika to a study session to prepare for their final exams. When they all arrive at Momo-kun's room, Kurihara-san is unbearably nervous. Meanwhile, Momo-kun is bothered when he sees Rihito and Shota being friendly with Kurihara-san.

Eps.5 Kurihara-san and Norika receive a lesson on potatoes from a young boy (?) they run into at the supermarket. The boy (?) is actually Rio, one of Momo-kun's female classmates. Rio, who has developed a crush on Momo-kun, refuses to acknowledge Kurihara-san is worthy of being Momo-kun's girlfriend... Eps.6 Momo-kun grows concerned when Rihito and his other friends point out that there's a strange distance between him and Kurihara-san. Momo-kun gathers all his courage to close the distance between them. Meanwhile, Kurihara-san is seen while secretly watching Momo-kun as usual! And the person who sees her is...

Eps.7 Momo-kun somehow manages to get through final exams. However, Kurihara-san says she has to leave early to take care of something important, and he spots her with his classmate Rio. Meanwhile, Kurihara-san gets Rio involved in a particular act while attempting to get to know Momo-kun better. Eps.8 Curious as to why Kurihara-san prioritized seeing Rio over himself, Momo-kun finally decides to ask her directly, but... for some reason, Kurihara-san is in trouble?! The first year friends decide to have a barbecue together, and Momo-kun calls Kurihara-san to invite her.

Eps.9 Kurihara-san agrees to go to the barbecue. The super excited Kurihara-san prepares for the barbecue by going shopping with Norika. The day of the barbecue, she engages in lively conversation with Momo-kun's friends, and everyone seems to be having fun, but there's something Momo-kun just can't say... Eps.10 Eating meat, frolicking about, and blowing bubbles, Kurihara-san and her friends enjoy the barbecue each in their own way. However, the low temperatures keep them from playing in the water, which means Kurihara-san will lose her chance to show off her swimsuit to Momo-kun?! The thought depresses Kurihara-san, but when Momo-kun sees how she's feeling...

Eps.11 Momo-kun and Kurihara-san head to the festival together. Momo-kun blushes when he sees how cute Kurihara-san is in her yukata. While walking around the stalls, Momo-kun realizes the older Kurihara-san is taking the lead. He makes up his mind to lead the two of them, but he becomes separated from Kurihara-san in the crowd. Eps.12 Momo-kun is saved by Rio at the festival, but because his phone's battery is dead and he's unable to call her, he asks for help looking for Kurihara-san. Unable to tell to Momo-kun that she actually has Kurihara-san's number, Rio reaches out to Kurihara-san and meets her at the shrine...