A shut-in ever since he had a traumatic experience, Nukui Hibiki's biggest hobby has been using vocalization software to create and uploading 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.
You can now watch Angel's 3Piece! online on the following streaming providers in the United States.
| Visual Effects | Tinkle | Character Designer |
| Sound | Yuko Ono | Theme Song Performance |
| Sound | Ryosuke Naya | Sound Director |
| Visual Effects | Takayuki Noguchi | Character Designer |
| Sound | Yurika Endo | Theme Song Performance |
| Sound | Aoi Koga | Theme Song Performance |
| Visual Effects | Tatsuo Nakajima | 3D Director |
| Writing | Sagu Aoyama | Original Series Creator |
| Production | Tetsuro Satomi | Producer |
| Editing | Akinori Mishima | Editor |
| Writing | Erica Masaki | Lyricist |
| Camera | Tetsuya Kawata | Director of Photography |
| Sound | Akito Matsuda | Original Music Composer |
| Writing | Gou Zappa | Series Composition |
| Art | Hiroko Tanabe | Art Direction |
| Art | Shinya Kuwabara | Assistant Director of Photography |
| Directing | Shinsuke Yanagi | Series Director |
