전체 에피소드

말수가 없고 사람들과 잘 어울리지 않아 어딘가 신비스러운 분위기의 코이즈미. 같은 반인 오오사와 유우는 그런 그녀가 신경 쓰인다. 어느 날, 집으로 돌아가던 유우는 우연히 라멘 가게 앞에서 줄을 선 코이즈미를 발견하고, 엉겁결에 자신도 그 줄에 합류한다.

귀여운 외모로 인기가 많은 미사. 처음으로 고백 받고 사귀기로 한 남자친구와의 휴일 데이트에 들뜨지만, 인기가 많다는 이유로 차이고 만다. 좌절하던 미사는 그곳을 지나는 코이즈미를 발견하고, 자신이 차이는 모습을 들켰을까 두려운 마음에 그녀의 뒤를 쫓는데…

코이즈미와 친해지기 위해 고민하던 유우는 같이 패스트푸드점에 가자고 제안한다. 바로 거절당하면서도 좌절하지 않고 재차 제안하는 유우에게, 코이즈미는 자신도 패스트푸드점에 가 본 적이 있으며 거기서 라멘을 먹었다고 말한다.

Worried over whether Koizumi has a boyfriend, Yū follows her to a Western restaurant, where she seems to meet up with a bunch of guys. To her relief, Yū discovers that Koizumi was simply waiting for an open space in a ramen stand behind the restaurant. Later, Yū goes to a ramen restaurant with Misa, each ordering red Akamaru ramen and white Karaka ramen respectively, while Koizumi goes to it moments after they leave. During the weekend, Jun comes across Koizumi at a convenience store and tries out her recommendation of instant ramen.

Koizumi enjoys her latest favorite, Tomato Ramen, while Yū provides her own commentary. Upon hearing about the beneficial algae, euglena, Jun goes with Koizumi to try some green ramen which is rich in euglena. Later, Yū stands in a huge line for a popular ramen shop with the intent of switching out with Koizumi, getting angry with someone else when he cuts his friends in. In the end, they get told off by Koizumi and all decide to go to the back of the line to show their appreciation for the ramen.

Koizumi gets up early in the morning to eat some dried sardine ramen, catching the eye of Yū's older brother, Shū, who tries the same thing. On a hot sunny day, the girls take Koizumi's cue and try various types of cold hiyashi ramen. While attending a ramen fayre at a museum, Koizumi comes across a lost German girl named Hannah, sharing some of her ramen with her before helping her reunite with her mother. As thanks, she receives a voucher for some German-style ramen.

As summer vacation begins, Yū, Misa, and Jun go to an amusement park together before touring around Asakusa in yukata. Afterwards, Yū runs into Koizumi and decides to accompany her on a "nationwide" ramen tour around the city, trying ramen from across Japan.

While Yū and Misa go to the Katase Higashi beach, Jun accompanies Koizumi to a shop that serves local variants of instant ramen from all across the country, becoming curious about what career she is aiming for. Later, Shū and his friends go to an iekei-style restaurant to try ramen with rice, becoming awed when Koizumi enters the same restaurant.

Koizumi hikes up Mount Tsukuba in order to work up an appetite for its local ramen shop. Misa's younger brother Kenta tries to tackle the sizeable Buta Yarō ramen in Akihabara, he becomes motivated after seeing Koizumi easily manage the mega-sized portion. Later, Misa, believing Koizumi to have some secret behind her beauty, inadvertently ends up ordering a ramen full of back fat alongside her, leading to an addiction.

Yū becomes curious about a mysterious blue ramen that Koizumi was eating. Shū invites Yū to a conveyor belt sushi restaurant where they spot Koizumi enjoying one of its ramen dishes, prompting them to order some themselves. Later, Jun invites everyone to a Chūka restaurant in Kagurazaka to help her eat a massive gyōza her mother had reserved, with Koizumi ordering countless ramen dishes on top of it.

Yū tries to recall a tasty ramen she ate in Osaka when she was a kid, which turns out to be a dish literally called Tasty Ramen. After Yū and Koizumi go to a Tokyo branch at Kabukichō to try the dish, Koizumi goes on a ramen pilgrimage to Osaka where she encounters a woman named Ayane. Serving as Koizumi's bodyguard against guys trying to pick her up, Ayane accompanies Koizumi during her remaining ramen stops. Hearing about how Ayane is due to leave Osaka after quitting her job, Koizumi takes her to a ramen restraurant that she remembers from her childhood, but is later slightly disconcerted upon discovering that Ayane is actually Yū's cousin.

While heading home from Osaka, Yū ends up stranded in Nagoya after seemingly spotting Koizumi from afar and hopping off the train. With only 500 yen on hand, Yū goes to a fast food ramen shop, where she thankfully runs into Koizumi. Later in Autumn, Koizumi catches a cold and ends up taking several days off school, her continued absence taking its toll on Yū. After Koizumi eventually recovers, Yū decides to leave her alone to let her enjoy her first ramen in weeks.