|Umibe no Yakusoku|
|Animation Director||Haruo Ōgawara, Takuya Tani|
|Japanese Air Date|
June 7, 2015
|Ending||My Best Friends|
|← A Special Day||A Long Night →|
Seaside Promise (Umibe no Yakusoku) is the tenth episode of Season 2. In this episode, the girls spend their time at the beach for the day.
With a long day of swimming, fun, embarrassments, and misunderstandings, the girls enjoy their time out at the Beach. Meanwhile, Sakura and Akari decide to get in on the fun and also go to the beach.