Konosuba - God's Blessing on This Wonderful World! Vol 7

From the Yen Press edition

Arcanletia is known for its hot springs, but perhaps even more for its devoted Axis Sect following, which is making Kazuma quite uneasy, and he's not alone. He'll need to get it together, though, because something is polluting the hot springs, and he needs all the relaxation he can get!

Source: Yen Press