I apologize for any grammatical errors that may appear, but English is not my language.

Unlike subtitled, "Sexy and Stupid Water Polo Comedy!!", manga is not just a fap material, and the story is not only about Water Polo. It can be said that the story is about the maturing of the protagonist (lazy, unmotivated and gave up everything quickly), which after entering the Water Polo Club and fall in love, begin to find their motivation.
The story is not very deep, but it's nice, and greatly improves after the appearance of Hayami character, enhancing the story and rhythm.

And yeah, the ecchi factor is a strong point!