Right when Nene and co. need information from someone close to Tsukasa, Mitsuba shows up in front of the Minamoto household, promising to tell Kou anything he wants to know if he can show him a good time. This turns out to be harder than you might think for someone with Kou’s sense of “fun”—but luckily enough, there happens to be a mysterious aquarium open in the dead of night...
