The series focuses on the adventures of Arata Kasuga, a high school student, who is targeted by Lilith, a teacher at a mystical school. Given three choices in an effort to help save the breakdown phenomenon of the world by evil forces and while attempting to solve the mystery of his beloved cousin and childhood friend, Hijiri, who disappeared to a difference space.
You can now watch Trinity Seven: Heaven's Library & Crimson Lord online on the following streaming providers in the United States.
| Directing | Hiroshi Nishikiori | Director |
| Writing | Kenji Saito | Screenplay |
| Writing | Kenji Saito | Comic Book |
| Writing | Kenji Saito | Original Series Creator |
| Writing | Kenji Saito | Original Story |
| Art | Akinari Nao | Original Series Design |
| Visual Effects | Shinpei Tomooka | Character Designer |
| Sound | Yasunori Ebina | Sound Director |
| Camera | Mami Goto | Director of Photography |
| Editing | Kazuhiko Seki | Editor |
| Visual Effects | Kaoru Nishimura | Color Designer |
| Sound | ZAQ | Theme Song Performance |
| Visual Effects | Shinichi Iimura | Key Animation |
| Visual Effects | Tatsuo Nakajima | Key Animation |
| Visual Effects | Naoto Yamaguchi | 3D Animator |
| Visual Effects | Koji Kawashima | 3D Animator |
| Art | Megumi Yamamoto | Art Direction |
