かつて海だったところを埋め立てられた近代都市ワダツミシティ。そこを正体不明の怪物が襲う事件が発生する！！
早速調査に向かったカイザキとイチカが見たものは、怪しい老婆、謎の少女、謎の仮面衆に、謎の緑の生き物。そこはまるで摩訶不思議が集まる怪奇祭りのような場所だった！？
An incident of an attacking from an unidentified monster takes place in a modern city, built where it which was once an ocean, Wadatsumi City!!
Kaizaki and Ichika are immediately sent to investigate. The pair find a suspicious old woman, a mysterious girl, a crowd wearing peculiar masks, and a strange green creature. Is this a place where mysterious events gather?!
