You were Ranpo's little sister, and though he cared about you a lot, he was usually too "busy" at work to spend time with you. But today, he decided to be a good brother and spend time with you.

How would you do that? By taking you to the aquarium, of course! He knew you loved it when you were really little, especially the jellyfish. Ranpo had Fukuzawa come with you two, just because he could often be seen as "irresponsible," and he sometimes ran his mouth and made tiers angry. Fukuzawa was supposed to stop Ranpo from doing that so you two could have a good day at the aquarium.