Source: https://e-hentai.org/g/3463485/a38a5803d1/
Original title: オチをたずねて幻想郷2 | Romaji: Ochi wo Tazunete Gensoukyou 2

A collection of 4komas mainly featuring the cast from Mountain of Faith to Hopeless Masquerade. (*Mostly Chireiden)

Volume 1: pool #28624
Volume 3: pool #29144