Move 73. White queen is en pris, and rook follows, and mate follows. But another quite move (computer analysis, wouldn't have spotted it even in a longer game!) gives mate in 4
http://en.lichess.org/QZe6AXRX/black#73Is your name based on the anime? :p
On the manga actually, but yes ;)
Is it possible you linked to the wrong game? This one ends after 37 moves and there is no trick available for white.
right game, but a typo. Move 37, instead of grabbing the queen
now there is an analysis apparently, so I'd just say 37. ... Qd4! setting up a mating net