Kare no Amakunai Shuushin

Minato, a music student, is attacked by a mysterious man the night his beloved cat dies. Just then, a grim reaper named Nero comes to his rescue, telling him he's come to take him.

Nero continues to protect him whenever he's in danger, but Minato, unable to understand his true intentions, is terrified. However, each time he experiences Nero's kindness, he finds himself beginning to accept him, a feeling of bewilderment within him.