Tutu

__[Official Website](http://yakushimaruetsuko.com/)__ | __[Profile](http://yakushimaruetsuko.com/category/profile)__ | __[Twitter](https://twitter.com/mirairecords)__ | __[Instagram](https://www.instagram.com/mirairecords/)__ __Etsuko Yakushimaru__, alternatively known as Tika Alpha when writing lyrics and doing composition, is a Japanese singer, producer, composer, lyricist, arranger, artist, who is also a member and lead vocalist for the band [Soutaisei Riron](https://anilist.co/staff/152353/) (相対性理論).