Seems like you're a little bit confused about the characters. You got them mixed up. But anyway, the 'probability' arc of the manga you're looking for should be this:
http://www.mangago.zone/read-manga/iris_zero/mf/v06/c028/
Oh my so it wasn't a he but a she... well I probably got confused because it has been a long time since I've read this so my memories are a mess I probably have read many kinds of mangas just forgot about it but mixed up by the forgotten ones Only an encounter will make me remember it(￣∇￣")....Oh and by the way THANK YOU FOR HELPING ME!!!ヾ(☆▽☆)
I came across the word probability and suddenly I remember a manga (probably shoujo)a boy with his eyes that can see the probability of something and is afraid of going into the alley that there is a probability that there is some dog that will chase him and I remember he hates peas although he always order it ,it has the probability that it's something the girl likes. If I did not mix it he has a brother in which or something that he saw there is a chance he/she will drown because of something he threw...Plz help ╥﹏╥