here’s an extended how to.
- First get the "Find the Culprit" Quest on the 17th of May from Keppler in the Library.
- Enter the Rune Graphology and Healing Remedies Classroom then check the desk with the red doodles.
- You can then turn in the quest right away or head to the sparring field and talk to Winston for more info. Either way, have this quest done BEFORE MEETING MEYZA A SECOND TIME.
- After the whole biting incident with Fia, agree to go visit her with Thane. You have to or else he will bond with her.
- Answer anything for with the talk with the boys on curing Thane, but do not cure Thane. DO NOT CRAFT THE CURE POTION.
- After finishing Io's arc, Thane should ask you to bond, say yes.
If you don't cure Thane and reject to bond, he will always bond with Fia. If you cure him, he won't be dateable to the point he is willing to go to your world