Where to watch online anime? Season - Summer Page 12 - Zoro? Right Here!

A group of school children are invited to compete in the strongest man competition. As the first match is starting, the bored organizer announces that all matches will now be to the death. None of the competitors have a problem with the change. Who will survive and be crowned the strongest? (Source: AniDB)

When Minato Kiyomizu wakes up in a hospital, he learns that he has been comatose for 203 days. As it turns out, a car accident has caused him to lose all memory of his middle school journey. Eventually, he discovers his former glory in water polo and desires to continue where he has left off. However, embarrassingly becoming aware of the massive disparity between his old and current self, Minato begins intensive rehabilitation in hopes of starting anew—a life without water polo. Yet, Minato is promptly reminded of his past prowess and a promise on his very first day in Yamanami High School. Soon enough, despite being completely aware of his ineptitude, he joins the school's water polo club! While needing to relearn the sport's basics, he, along with his clubmates, must recruit new members to attain the required seven-man roster. With that, Minato tries to rekindle his deeply buried talent for water polo—and become one of Japan's renowned players once again. [Written by MAL Rewrite]

Ninth season of Yami Shibai.

When he was little, Ryuuhei Oda witnessed the death of his caring older brother, along with a mysterious mark that was left near his body. Now a second-year high school student, the outgoing and impulsive young boy spends his days doing what he loves most—kickboxing. One night on his way home, a peculiar creature bites Ryuuhei's leg and causes him to have a strange dream filled with odd entities. When he is attacked the next day by the same creatures in the real world, Jessica Clayborn and Aruto Fushibe come to his rescue, claiming that Ryuuhei is their new recruit. Faced with an imminent threat, Jessica urges a confused Ryuuhei to transform into a "knocker-up," a person with the ability to confront the monsters hailing from the dreamscape. Using his talent for kickboxing to his advantage, Ryuuhei awakens his powers to save the city, only to come across a familiar mark—a mark that he could never forget. [Written by MAL Rewrite]