Kenji Saito’s (story) and Chako Abeno’s (illustrations) Trinity Seven: Liese Chronicle Vol.1 was released on 8 August 2017.
The spin-off series is currently being serialized in Kadokawa’s Monthly Dragon Age and has Lieselotte from Trinity Seven as the heroine. To save the future, which seems to be falling apart, Liese jumps back into the the past. In the beta world she arrives in, Liese is like a different person and works for the Trinity Seven of Acedia. Being at a loss because of the differences from the original time and this one, she searches for the cause that made the future collapse.