Brothers

The two of them surely having a good time together, because the Rank E Wizard is an idiot.

"Muahaha, hey human your funny mauaha"

"I was training here every single day"

"Your punching the tree instead of doing magic training hahah"

"....I didn't think about that...What the F**k I've been training for 10 years now!!"

See told you, Yuu found an idiot friend.

"Bro, what's your name?"

"I'm Yuu Bro, How bout you?"

"I"m Zoel Brandon"

"From now on we're Brothers!