Kono Sekai wa Fukanzen Sugiru

Nikola lives a simple life in a remote village of the Kingdom of Bayle until a huge dragon, a creature that should never approach human settlements, suddenly appears. The village is saved by a peculiar man named Haga, one of the Seekers tasked with investigating faults and abnormalities in the world. His meticulous habits and fascination with every detail spark Nikola's curiosity, leading her to leave her repetitive life and travel with him.

She soon learns that Haga's odd behavior is only the beginning of the truth. The world she knows hides a much deeper flaw, and things that appear natural may be parts of a system that is not working as it should. With each place they investigate, the pair moves closer to secrets that touch their very existence, while Haga struggles to correct the world's errors without becoming trapped by them.