When Matsuda Was Transported to an All-Rei World

*A short story, only a few chapters long Jinpei Matsuda was blown up and killed. But then he became a ghost. Jinpei Matsuda: ? Maybe it was fate. After drifting aimlessly for a month, he happened to arrive on a rooftop and witnessed one of his classmates taking his own life. Jinpei Matsuda: ... Maybe to comfort him, Matsuda followed the devastated Rei Furuya around, watching him struggle through his undercover work. Two years later, he finally left Rei Furuya for a little while, planning to visit his long-unseen class leader. But then he witnessed a car accident. Jinpei Matsuda: ... Seriously? Four out of five of his classmates were dead. What kind of sick joke was this? When he returned to the safe house and saw Rei Furuya's lonely, desolate figure after hearing of Wataru Date's death, he felt terrible for him. But when he saw Rei Furuya sleeping only three hours a day and working nonstop for the Public Security Bureau and Café Poirot, he could only curse himself for not being able to hit him. One day, he found a white ball. Even as a spirit, he could touch it. Before he could investigate further, the ball floated into the air. "Make a contract with me! Then you can save your classmates!" Jinpei Matsuda agreed, but... Why had no one told him this world was messed up?! Theme: Not a single petal of the five-petal cherry blossom should be missing!