As summer nears, tired students Sana, Momo, and Muuko bond over a single coin and the bliss of cream soda. They cherish their fleeting moments together and seek creative ways to capture memories beyond social media, savoring the joy of childhood friendship.
There is a schoolgirl who carries her own personal chainsaw. She was attacked by a dead body who was created by her classmate one day. As such, she does not understand why she was attacked by a classmate. To find the answer she ventures into the enemy's base. There she finds out the reason for the assault.
Ooshima Shino is a 1st-grade high school student. She has difficulties pronouncing words that start with vowels in front of people. Because of her speech impediment, she does not get along with others. Shino meets Kayo who likes music, but she is tone-deaf. They decide to start a band and Shino begins to change.