It is a frequent occurrence to unintentionally cause pain to those we hold dear.
Taizou and Ikuto have been best friends since they were infants despite only having a year of age gap. They have gone to the same schools for preschool, middle school, and even high school. It was Ikuto's aid that assisted Taizou in passing his college entrance examination to guarantee their attendance at the same university. However, during their year apart, Ikuto grows distant and enrolls in a separate institution. Ignorant of his friend's sentiments, Taizou follows him to unravel the mystery.