W Wish - Season 1 Episode 6 Memories in the Darkness

Senna wakes Junna up for the Cherry Blossom Summer Festival. Just as Junna promised, the two spend the entire festival together. When Haruhi shows up, she cannot locate Junna, and Junna does not hear her calling for him. When night falls, Senna tells Junna that she's happy he kept their promise, but an image of Haruhi flashes through his mind. Junna is suddenly concerned about Haruhi and his past, but Senna tries to reassure him that he doesn't need to remember everything. Just as the fireworks begin, Junna's memory suddenly flashes before his eyes, causing him to pass out.