This CD is a solo album by Shiratori Yuri (白鳥由里).
The songs are as follows.
Yuri says..The title came from the rearrangement of the letters from Taisetsuna (taisetsuna = important). I wanted to make it sound like a girl's name. The album is full of things that I like and treasure. Things that I like are bicycles, calpis, jewels, red tea, rain, wind.. This album is like a treasure box to me.
When I was singing Aoisora to Jitensha, I almost started crying because it was too difficult. But I didn't want to cry, so I went out for a little walk. Then I got lost and walked around for 30 minutes.