A tale about a modern deep-sea aquarium employee in Tokyo!What's living in the overwhelming darkness deep within the sea? Take a glimpse into this strange world about a boy working at a deep sea aquarium.

Mahoro is a high school girl who loves her teacher.She studied hard to get her teacher to like her, but as a result, she is now a college student making her debut in a rural area, and is at a loss for what to do with her life for the first time!What will Mahoro see in the ancient city of Nara?