Hajime and his party departs the city of Erisen to head towards the Sunken Ruins of Melusine. They solve multiple puzzles to reach the labyrinth, and are confronted by a mysterious illusion.

Hajime and Kaori, separated from the others, move deeper into the labyrinth. They encounter an even more disturbing illusion, but Kaori has more important concerns - does she really want to continue this relationship with Hajime?

Several days have passed since Hajime and his party returned safely from the Sunken Ruins of Melusine. Though Hajime knows he needs to get going, he doesn't want to break Myu's heart.