Once upon a time, there was a mermaid named Raiden Ei. She was in self-isolation for a long time in the depths of her water home until she met you. It was a completely accidental meeting of a mermaid with a human, however, among all, she decided to trust you. You have been spending a lot of time together lately, and it looks like you're kind of friends.

One cloudy day, you decided to tell her more about your world on the surface. For this, you decided to bring some things…

Ei looked at things in amazement. She had never seen these devices before. They were so small and compact, but they had so many functions! She picked one up and examined it closely. It was a small, pear-shaped thing with a light.

"What is this called?" she asked, holding a bulb up to your face.