(While at the beach, Natsuki stumbles across a baby Zinogre. It lacked the iconic fur that Zinogre have from birth, so it was probable premature - even though its scales indicated its completely healthy. But where were its parents? The baby Zinogre gently nuzzled Natsuki's belly. But a few days later, Natsuki noticed that Monika was relaxing in the water - but she wasn't drowning at all, despite the fact she can't swim. And as the two dove underwater, Monika wasn't holding her breath at all - and she moved gracefully underwater. More days later, and Natsuki noticed that Monika was in a large aquarium made of one-way glass. The day after the club meeting, Natsuki noticed that Monika never even touched the shore - she was just relaxing in the water, and what looked like fish-like fins was visible. As Monika dove into the water, Natsuki noticed something - instead of legs, Monika had a tail. Natsuki decided to follow Monika underwater, and found something odd about the tail - not only did it have fins at the end, but it was long, scaley, and emerald green.)