The Aquarium

Mitsuba Sousuke and Minamoto Kou visited the aquarium in Chapter 98, but it turned out to be a supernatural trying to lure humans in.

Appearance
From the outside and inside, the aquarium seemed completely normal, even having lots of other people inside. It was very large, with multiple exhibits of different sealife creatures. This included sharks, seals, stingrays, worms, penguins and lots of different types of fish. It also has a rest area with food and drink dispensers and a marine life keychain automaton. The marine life keychain automaton had five different keychain options, out of which Mitsuba got an isopod and Kou got a penguin, but they decided to switch. When the aquarium turned out to be full of supernaturals, Kou and Mitsuba hid in an employee pathway.