Let's go to the Hot Spring

Let's go to the Hot Spring is the fifth chapter of Mazinger Otome.

Summary
Seto and Koji are out after fighting the Mechanical Beast Army with Seto feeling bored because the regulation signs are preventing her from using her abilities just about everywhere in town. She spots Shiko at the lottery where Shiko is aiming to get the year supply of cup ramen. However she ends up winning the grand prize of going to the Shinabita Hot Springs. While Shiko decided to throw it away, Koji and Seto convince her to use with everyone else. At the springs, everyone is excited at the attractions even though they cause a little mayhem. Everyone checks in to the inn, but while everyone wants to go the springs Seto stays at the room. At the men's hot spring Juzo, Kenzo, and Koji decide to check on the women's bath. While Juzo and Kenzo are satisfied by the sight of the women as their robot mental images, Koji peaks over to see the girls as their regular selves. Unfortunately for him, Grace's vision makes her see Koji as a demon unleashing her Space Thunder on him. Afterwards, everyone goes back to the room where people do tricks, some not as enjoyed as others. With the professors passed out, everyone else wants to go back to the hot springs but Seto wants to stay behind. While Koji thinks she's embarrassed, Seto says that her Photonic Energy could cause a dangerous reaction. While everyone believes differently about the effects, they decide to test it by throwing Seto in the spring. While at first nothing happened, Seto suddenly exploded destroying part of the inn and making a huge crater. The news interviews Koji while noting that Seto was missing. Everyone else is alright while noting that Juzo is trying to fix up Seto. While everyone is ecstatic, Reito is suspicious.

Trivia

 * When Grace mistakes Koji for a demon, he is in the appearance of the manga version of Devilman.
 * When Grace attacks him, Koji even states the battle cry of the anime version of Devilman.
 * The scene is also a reference to the scenes where a Devilman statue appears in hot springs in a few series in Mazinger.
 * When Shiko is singing, a picture of Enma-kun is seen on the monitor.