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.
Koizumi is a mysterious and attractive high school student. But what most people don't know about her is that she's a ramen master who is always on the lookout for great ramen restaurants. Everyday, she goes hunting for real-life places serving the best ramen dishes and delightfully eats the delicious noodles. The way Koizumi downs a giant bowl of ramen–more adeptly than any large man–will amaze and delight you!
