Keitai ga Ochiteita.

A woman named Momoka discovers a mobile phone on the ground after returning from a date. She receives a message suggesting the phone's owner is observing her, prompting her to take it to a police station where her former partner is employed. The situation surrounding the phone remains unclear. Separately, Kurumi Shinohara, who regained her sight after a retinal transplant, was cared for by her cousin Shuuichi Kaidou, who has viewed her as his future wife. This dynamic is disrupted when an unknown boy questions Kurumi about her happiness.