Tenshi no 3P! Angel's 3Piece!
Nukui Kyou is a first year high school student hikikomori. His hobby is making vocaloid songs and uploading them online. One day he receives a mail from a fan asking if they could meet up with him. At the meeting place, 3 elementary school girls were waiting for him. The 3 of them want to form a band, and ask for Kyou's help.