Summer Vacation! - S1.E6

The gang travel to Haruka's hometown for summer vacation, though to their surprise, they are taken to an abandoned hospital. After being chased by some supposed monsters, they discover the hospital is actually part of a theme park Zenzou made for Haruka's arrival. The next day, the gang head to a private beach, where Haruka ends up getting pulled out to sea, prompting Yoshihisa to rescue her. After sharing lunch together and enjoying some fireworks, Haruka gives her thanks to the others for showing her how fun summer vacation can be. Meanwhile, Haruka's mother, Kumiko, is seen watching them from above.