If you're looking for manga similar to Hantsu x Trash, you might like these titles. All recommendations are made by Anime-Planet users like you!
Our hero, who doesn't know how to swim, joins his school swimming club and begins to learn from their star swimmer who loves swimming more than anything. Good thing she's cute and nice to boot!
Welcome to fanservice paradise. These two titles have all the fanservice you want: ecchi, ecchi and more ecchi. Both of them lack in story and characters so don't expect anything. What do they have in common beside ecchi and romance? Swimming. You already know what to expect, don't you?