Suterare Shiro Mahoutsukai no Koucha Seikatsu

A white mage named Amalia is betrayed by her party during an attempt to subdue a golden dragon, which leaves her severely injured and abandoned. The dragon, moved by her plight, heals her and asks her to observe human life in return. Taking the form of a child named Yuugo, the dragon joins Amalia. When Amalia agrees, she discovers that ten years have passed. Struggling with the change, she begins a new life with Yuugo as her foster son, working to fulfill her task. Yuugo becomes fascinated with tea culture, and Amalia, skilled in tea preparation, starts a life centered around brewing and sharing tea with him.