younha was once again chosen to be an anime theme singer for "kiba". the song "hakanaku tsuyoku" was used as the second opening for the show. the single was released on 17 january 2007. this single, unlike her other singles, has only 3 tracks. surprisingly, this single appeared on the top 20 daily charts for exactly one day, at #16. the weekly rank was at an above-average #36, but sales were only slightly better. this single did not have a pv because younha was in korea during the month before and most likely january as well.