Yuugen is a high school student who is sickly and can't do anything tiring so he avoided getting involved with his classmates and lived a colorless life.

The class representative, Shuuto (real name: Asahi Hideto), talks to Yuugen everyday even though he's like a lonely ghost. Yuugen secretly admired Hideto, who was cheerful and loved by everyone.

However, one day, Hideto suddenly dies. Hideto became a real ghost and appear to the "ghostie" Yuugen who is trying to avoid him, but since they are connected, now he needs to help Hideto solve his unfinished businesses and pass on.

A bittersweet, beautiful and sad dramatic romance.