Muteki no Baby Blue

Ritsu, a high school boy from the countryside, is enjoying school life with his classmate Shion - playing in a band, getting scolded by the teacher, eating ramen, and more. He thought he would continue the rest of his days like this... but one day, Shion kisses him! What will become of these feelings that have just burst out of him? The youth of these two lovable idiots begins★

(Source: Kadokawa, translated)