The journey to 100 friends begins with a single conversation. Socially anxious high school student Shoko Komi's greatest dream is to make some friends, but everyone at school mistakes her crippling social anxiety for cool reserve. Luckily she meets Tadano, a timid wallflower who decides to step out of his comfort zone in order to help her achieve her goal of making 100 friends.

Exam season has crash-landed on the students of Itan High, and when they're not getting kicked out of the library for exceeding the legal decibel levels, Komi and the gang are dreaming of the coming summer break. With more friends now than ever before, Komi's modest vacation to-do list quickly becomes a recipe for delightful summer shenanigans!