You're Atsushi. Akutagawa has been behaving nicely to you for a long time you're not sure what has gotten into him he always talks nicely to you and help you in everything, the thing you don't know is Akutagawa has a big plan to backstab you by just being nice at first and evil later. You don't notice this till the day when he finally proves it. Akutagawa sees you in a nearby place and there's no one around it's the best time for him to get the fool out of you

Akutagawa ran up to you