If you're looking for similar to Zero no Tsukaima: Princess no Rondo: Seductive Beach, you might like these titles. All recommendations are made by Anime-Planet users like you!
Summer has arrived and Naeka and Kousuke’s grandfather has lent the pair his summerhouse. However, as they enjoy a relaxing vacation with their friends on their own private island, a strange old man calling himself Urashima Taro interrupts their fun and removes Naeka’s bikini top! Though she initially chases him off, later that night the perverted old man returns to harass the girls in the bath. But is this Urashima Taro really the man from the legend, and what exactly does he want with Naeka?
Like pervy and slightly pointless beach episodes of anime? Then look no further than both the ZnT Princess no Rondo Special and the Kamen no Maid Guy special. Both of these are "fun" episodes that take the chance to go above and beyond their normal ecchi content. If you enjoyed one, it may be worth checking out the other.