Tsukimizuki Rikai no Tantei Satsujin

A new student arrives at school in a wheelchair, having returned after an illness. She kisses Tsuzuki Ui, addressing him as "Rei-kun." He recognizes her as the daughter of a wealthy family and a former opponent in an online murder mystery game, which he had won. She is obsessed with him because he was the only one to ever defeat her and has now come to meet him in person. She intends to conduct a real-life murder mystery game, focusing on the presumed suicide of Tsuzuki's father. She suspects his younger sister, Haruka, though the reason is unclear.