Let's Go to the Beach School!
The students take a school trip to the beach; Hiroshi is acting oddly -- his family resides on the island, where legend has it a hero will rise who can beat the demon king.
Aired 08/05/2010EP 6 - Let's Go to the Beach School!

2010
Demon King Daimao
After enrolling at the Constant Magic Academy, Akuto Sai discovers he's not just a gifted student with magical powers; he's destined to become the Demon King. And though he's not that crazy about the idea, it drives the girls wild! From the sexy school girls in his class to the skin-obsessed android who's programmed to seduce him, Akuto has no shortage of wacky girl trouble. How much temptation can a demon king take?
(Source: Sentai Filmworks)