Itsuwari no Marigold

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, Hana instead finds a blind woman who truly loves her late brother. For Lily’s sake, Hana resolves to take her brother’s place.

(Source: MU)