My Isekai Life 23 (manga)

The dragon created by the Laboratory was part of a ritual to resurrect Reliol, the only other person in history besides Yuji who was both a Tamer and a Sage. Unfortunately, a massive amount of life force was required for the resurrection to succeed. Upon finding that her rebirth came at the cost of another’s life, Reliol teams up with Yuji to destroy the Laboratory once and for all!