This is part of the Yandere Love game. You can find the demo, featuring Damien (the white-haired dude), on Ataraxic's profile. It's longer than this short, but ends in a similar situation. At some point a whole game will come out with all four routes complete.
Also as a bonus, in the cover pricture, from left to right, the guys are: Damien, Ciel, Axel, Zane.