Yuhee is an ordinary girl who attends a private school.
While waiting for her school bus, she picked up a bright purple conch shell on the beach.
She fell asleep on the bus due to unbearable drowsiness. What unfolded in front of her when she woke up was a school that had sunk into the deep sea and an abyss of followers following the high priest.
She solves puzzles prepared by Abyss Followers, avoids terrible monsters, and begins a journey to escape this Abyss School and return to her original world.

 

裕熙是一名就读私立学校的普通女孩。
在等校车时，她在海滩上捡到了一个亮紫色的海螺壳。
由于困倦难耐，她在公交车上睡着了。
当她醒来时，展现在她面前的，是一所沉入深海的学校，以及追随大祭司的追随者的深渊。
她解开深渊追随者准备的谜题，躲避可怕的怪物，开始了逃离深渊学院、回到原来世界的旅程。