Yasashii Boukyaku (優しい忘却)

"優しい忘却" (Yasashii Boukyaku) is a single by Minori Chihara, released on February 24, 2010. Kyoto Animation used the song as the theme song for the film 涼宮ハルヒの消失 (The Disappearance of Haruhi Suzumiya).

Aki Hata wrote the lyrics, and Satoru Kōsaki composed and arranged the song. The single also includes the B-sides "Undercover Agent" and "覚醒フィラメント", reached No. 8 on Oricon's weekly singles chart, and later appeared on Chihara's album 『Sing All Love』.