I'll forget everything one day, even the precious time you gave me
Part of the Scene series. It's from the man's point of view.
He thinks back on his girlfriend's constant cheery mood and talkativity and her habit to call him "stupid". However the last day he saw her she's crying and he was unable to understand why, and he admits that he really is stupid. After that she left him without so much as a goodbye and he wishes that he'll meet her some day again, yet it hurts so much that a part of him hopes he can forget.
It was featured in the album Kimi ga Utau Boku no Uta.