神語 ～かんがたり～

Main character is leading an ordinary school life. But then one day a student is found in the form of the living vegetable - organs are functioning normally, but there is no consciousness. Such living vegetables start to increase with each day. At the same time the unrivaled protagonists gets beaten by another boy who somehow acquired superficial powers. There's some great conspiracy unwinding, and school administration seems to be involved.

[From vndbreview]