Akiba's Trip The Animation- help?

Right so i have a problem I need to know if the character with green hair is a girl or a guy, because me and my boyfriend have been debating about this since episode 1. http://img1.ak.crunchyroll.com/i/spire3/931bec88fefffbf70581e05549e4e41c1484151281_full.png If anyone knows that'd be a great help.

it s probably a guy (no breasts visible, blushing when making contact with the blondie s breasts, otherwise it d be a lesbian titless girl lol :P