Who knows which cartoon this picture belongs to?

Tell a story about a "dolphin man" named Haruka Nanase. He likes to touch "water"-that is, he likes swimming. When I was in primary school, I took swimming lessons together, and I won the swimming competition before I graduated from primary school, and then I went my separate ways.

Time flies, living a dull high school life and suddenly reunited with Song. The two men competed again, and Song won a great victory. But the story is not over. On the other hand, Tachibana Makoto and Ye Yuezhu came together again, introduced a new member, Long Qilian, and established the swimming department of Yanyuan Middle School. This is the story of swimming × youth × friendship of energetic male high school students. ...

This man is Song.

Seiyuu: Mamoru Miyano

Height: 177cm

Weight: 68 kg

Birthday: February 2nd.

Constellation: Aquarius

Representative animals: sophomore of Shark Shackle College, majoring in freestyle (jet swimming) and butterfly. There is a shark tooth. The biggest enemy at present. I stopped swimming training and went abroad to study, but I changed without warning when I came back. Confuse former teammates. After my first year of studying abroad, I started a one-on-one challenge with Yao in the 100 meter freestyle. As a result, I was completely defeated by Yao, who showed real strength. I felt Yao's true attitude towards all challenges and the perfunctory game before, which made Lin very dissatisfied. After studying abroad for four years, I didn't receive swimming training, and I didn't join the swimming department of Shark Handle College immediately after returning home. After competing with the remote, for some reason, the swimming department was created in the remote, and then the shark handling swimming department was added.