As high school days rush by, Mikako Ichimura, a 17-year-old, finds her future and romance hanging in uncertainty. Amidst this, a peculiar classmate named Midorikawa, who has a fondness for red pencils, becomes her new seatmate. Their bond initially sparked by a shared love for a band, gradually transforms, painting the subtle evolution of a teenage girl's daily life. Explore Mikako's journey through a series of chapters like 30.5, 60.5, 90.5, 120.5, 150.5, and 180.5, all delicately intertwined with a touch of literary charm.