She is the first fairy that Willem is shown to meet in the series. She is shown to have feelings for him. It is also shown that he has some feelings for Chtholly, however he wishes others not to know this. In Episode 10, he asks Chtholly to marry him and she answered with "I will always stay by your side and make you happy".
Lillia Asplay Edit
Relationship with Lillia is unknown but within the light novels and anime it is coveyed that they have strong feelings for each other as hinted when she was going to stab Elq with seniorious "I'm doing this for one reason... it's for my love" assumably meaning Willem because she went to kill Elq so Willem didn't get the idea too