Madoka Kyouno (Kaori Ishihara) - Kimi no Motohe! (Rinne no Lagrange character song)
京乃まどか(石原夏織) - キミのもとへ!
(No video for this one.)
This one has an interesting beat, and the piano is quite calming in a sense.
ZUN - Sleepless Due to the Night (
Luna Child's theme)
夜だから眠れない