Angels 3Piece contains episodes 1-12 of the anime directed by Shinsuke Yanagi.

A shut-in ever since he had a traumatic experience, Kyou Nukui's biggest hobby has been using vocalization software to create and upload songs online. One day, he receives an email from some fifth-grader girls, asking to meet and discuss something with him.

The three girls, who have grown up together almost like siblings, ask him to help them show their gratitude to the people who have taken care of them. The method they've devised? Putting on a successful concert at a place full of memories!