Iris Zero by Hotaru Takana

IRIS ZERO
B-U Manga | On MF

Alternative: アイリス・ゼロ; Airisu Zero
Year: 2009
Status: Ongoing
Author: Pro Shiki
Artist: Hotaru Takana
Genres: Mystery, Romance, School Life, Seinen, Supernatural
Synopsis: In a world where every boy and girl has a special power called Iris, Toru who, as a result of not having any kind of special power, was bullied from a young age, lives by his motto: “low exposure” – to live without standing out. But his peaceful school life changes when he receives a certain "Confession" from the schools most popular girl, Koyuki. His motto begins to shake!!
The school fantasy story that shakes the heart begins with their meeting.

is iris zero really a seinen it seems more like a shounen

It is serialized in Comic Alive, so it is seinen.