Not sound serious

Not sound serious a song by Sei on Archodia Music

失落 by Sei ,
A.E.O.M. by Sei ,
(My thoughts) into the Sky by Sei ,
Smile by Sei ,
Just another day by Sei ,
Turn out the light by Sei ,
Not sound serious by Sei ,
What I feel by Sei ,
Shade by Sei ,
日常 by Sei ,
Bad girl by Sei ,
Mid summer by Sei ,
墓場の歌 by Sei ,
Forever by Sei ,