If you're looking for anime similar to The Greatest Magicmaster's Retirement Plan (Light Novel), you might like these titles.
Raust is a member of a first-rate party, but he can only use the low-level magic "heal." The story follows Raust as he finds friends who recognize him and as he rises up in the world.
The incompetent and lackadaisical prince, Arnold lived as he pleased. All around the empire, he was ridiculed an insipid prince who had “all the good genes being inherited by his excellent twin brother instead”. However, with crisis approaching due to the intensifying fight for the throne, he finally decided to show his true colors. “I have no intentions of becoming the Emperor, but I’m not going to lie down and get killed.” With the unparalleled sense of strategy and negotiation skills he had hidden so far, as well as his true strength as the strongest SS-Ranked adventurer who commanded taboo ancient magic, the insipid prince manipulates the fight for succession from the shadows together with the beautiful maidens who serve him!
The task of saving their school falls to Miho Nishizumi and her barely-seasoned tankery team. However, things go off track almost immediately when the Ooarai tankery team is pitted against the leading university team in an all-or-nothing match!
Reincarnated as a character in the legendary erotic game, “Magical Explorer,” it doesn’t take long for our hero to discover that he’s been designated the unlucky side-character rather than the game’s lady-killer protagonist. Not to worry, though! Armed with his vast knowledge of the game (and a few cheats) he’ll do whatever it takes to win the hearts of the game’s heroines and emerge as the most accomplished student at the Sorcerer's Academy!
Akeno Misaki and Moeka China share one goal—to join the Blue Mermaids! A group of fierce women, the Blue Mermaids are key to keeping peace among the seas and coastal cities in this age of maritime trade. To be a part of this elite group of sea protectors, they must succeed at Yokosuka's Marine High School. Akeno and Moeka, together with their classmates, will take the plunge to become Mermaids!