Tenshi no 3P! (2017)

Tenshi no 3P!

Kyou Nukui is a first year high school student hikikomori. His hobby is making Vocaloid songs and uploading them online. One day, he receives a message from a fan asking if they could meet up with him. At the meeting place, three elementary school girls were waiting for him. The three of them want to form a band and ask for Kyou's help.