
If you're looking for manga similar to 10-nen mo 20-nen mo, you might like these titles.
Third-year high school student Aya, who's secretly afraid of water, manages her high school's swim club. It's her last summer as manager and her final time managing the swim club for the Inter High Meet, but perceptive Takeru figures out her secret.
Hisui used to live on Kohaku Island, where she lived by the ocean and loved life. However, she’s changing schools and thus has to leave her best friend, Kairi the dolphin, behind… It’s at that time, Hisui meets the swim team’s hot Minato by chance…! Could this be a blooming love for the attractive boy, or a replacement for her dolphin Kairi?
Takumi Aono really wants to be a competitive swimmer! Like, really, really, really wants to be one. Although he swims everyday, rain or shine, he's still not there yet. But when he meets a very bitter lifeguard, something unexpected happens!
When Mizuoka sneaks into the pool after hours for extra swimming practice, he's caught by his classmate Hino! Hino agrees not to tell anyone he's broken in, provided he teaches her how to swim. Mizuoka agrees, and, though he finds himself liking her more and more, he really needs the extra practice for his swimming club status. Will Mizuoka's dedication to his club ranking destroy his chances with Hino?
Shuuhei, Harumi and Daiki start their second year of high school with an absolute goal: Getting at least two new members for their swimming club to keep its position as a club. This is the daily struggles and shenanigans of a high-school boys' swimming club!
All the girls are crazy over the swimming prodigy Wakatsuki Ran. Ageha, who wants to find love but isn't really looking that hard, bumps into him one day, and after surviving his sarcasm instantly pegs him as a "stupid, obsessed swimmer". Nonetheless, she is amazed by his talent and asks him to teach her to swim like him. How will their relationship develop?
Touko has loved swimming since childhood. However, as she enters her final year of high school, she realizes that she won't be able to become a professional swimmer. But in her last national inter-school championship, she meets up with a certain Haneda. He is none other than the boy she once loved...