Anime character with a hat and a sword in the water

Black-haired male pupil, boy, short-sleeved shorts, wearing a long cape, a straw hat with two streamers and countless wind chimes, blowing a green flute on the back of a huge fish made of water, leading more fish behind him

(nsfw:1.5),bad work, bad color, extra legs, extra fingers, bad body, bad finger, bad eyes