ロストワンの号哭 (Lost One no Goukoku)

Background
The boy in the video is named Mamoru.

This song is featured in Neru's major debut album Sekai Seifuku, released by EXIT TUNES.

This song entered the Hall of Fame on March 6, 2013 (after 1 day, 13 hours and 22 minutes), and the Hall of Legend on May 24, 2013.

This song is featured in the EXIT TUNES compilation album Vocalofuture.