Blue Archive the Animation - Season 1 Episode 8 A Secret
Overview: At Hoshino's suggestion, the Task Force and Sensei decide to go to the aquarium. The girls spend a peaceful time together, as if the days of battle up to that point had been a lie. Hoshino seemed to enjoy herself as much as the others, but Shiroko felt a slight sense of discomfort. Determined, she took a certain action.