How come - Doushite Kounano? -

How come - Doushite Kounano? - a song by Yuki Saitou on Soniditos

Doyoubi no Tamanegi by Yuki Saitou ,
Sayonara Sayonara! by Yuki Saitou ,
Scooter 17 by Yuki Saitou ,
Pihyara by Yuki Saitou ,
Bouken Kozou by Yuki Saitou ,
Ushiro no Shomen Daare by Yuki Saitou ,
Amanojaku by Yuki Saitou ,
Ave Maria by Yuki Saitou ,
How come - Doushite Kounano? - by Yuki Saitou ,
When by Yuki Saitou ,
What by Yuki Saitou ,
Why by Yuki Saitou ,
Where - Kiniro no Yoru - by Yuki Saitou ,
Who by Yuki Saitou ,
Axia - Kanashii Kotori - by Yuki Saitou ,