Saigo ni Hitotsu dake Onegai shitemo Yoroshî Deshô ka

Based on a Japanese light novel series written by Nana Ootori and illustrated by Satsuki. The original light novel by Ootori and illustrated by Satsuki began in 2018, with four volumes released in Japan to date. A manga adaptation by Sora Hoonoki began in 2020.