Kasumi Hana travels to meet her deceased older brother’s penpal, Urushizawa Lily, with the aim to inform her of his passing.

As well as the intent to kill her, if Urushizawa had only been using him.

But when they meet, instead Hana finds a woman who truly loved her late brother, and who has lost her eyesight.

For Lily’s sake, she resolves to take her brother’s place.