拝啓ドッペルゲンガー (Haikei Doppelganger)

Background
The boy lost himself "Haikei Doppelganger" is kemu's 9th song that was uploaded on May 31, 2017. This was his latest song after four years of absence from the VOCALOID community. The same day of the upload, kemu revealed on twitter that he is Shota Horie from the band "PENGUIN RESEARCH" and that it was his birthday. Horie was suspected of being kemu in 2016 when the band's first EP featured his song "Haiboku no Shounen".

This song has entered the Hall of Legend.