Shiomi High School

Shiomi High School (潮見高校) is the former school that Hayate attended along with Ayumu before becoming a butler. This school is also the same place that Souya Minamino and Mitsumi Seto attend in the series Heroes of the Sea Lifesavers.

Swimming Pool
Shiomi High School, like any other high school in anime and manga, has its own swimming pool for physical education classes in summer. This place is where the Shiomi swim club holds its club activates and where Souya Minamino practices swimming. It is also the place that Mitsumi Seto talked about her future of wanting to become a lifeguard.

Baseball Club
This place makes an appearance in Season 1 Episode 46 and Chapter 516. In the anime, the ghost of a baseball club manager haunted the area. Isumi Saginomiya came here to send this spirit to heaven. This caused Wataru Tachibana to misunderstand the situation and challenge the baseball team ace to a one-pitch match for Isumi's heart.

Trivia

 * Although Shiomi High School first appeared in Heroes of the Sea Lifesavers, its name was never revealed until its appearance in Hayate no Gotoku!.