Color Of The End Mission In The Apocalypse (Manga) Vol 03 (Mature)

As Saya, Isami, and Kanoko journey together in search of Usa, the three unexpectedly come across a flower-filled mansion and its lone automated caretaker. The robot claims to have met the mysterious survivor, but in exchange for its information, it has a request of them... Yen Press
(W/A) Haruo Iwamune