Beside first meeting there's literally
zero romantic interaction. Even when Elena kisses him he didn't show any interest :/
Rei doesn't react to any passes from kitty-receptionist (forgot her name) in guild...
Rei declines Guild-master romantic passes... why would you decline beautiful dark elf with huge knockers?
![Er... what? o_O o_O](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
and many other boy-girl situations go without any interest from male side...