Pretty sure it's Larmanilla because Romiard speaks how happy he is and that with him. Also the tone of the words make most sense coming from Larmanilla. Hope I was able to answer your question owo!
The one who says I'm happy is romiard, at the last line 'that's a given' is said by larmanilla. The other comment already answered, but I hope it was helpful
Can you please tell me who is speaking near the last pages of the chapter is it Romiard or Larmanilla? Thank you.