Series: Touhou - Koumakan no Toshi Densetsu Jijou. (Aozora Market)

Artist: Aozora Market
Original title: 紅魔館の都市伝説事情。
Gallery: https://e-hentai.org/g/908358/27754bb309/

Flandre hears about the urban legend incident from Marisa and tries to recreate it in the Scarlet Devil Mansion.