Anata no Kotoba no Togirema wo.

High-school seniors Akira and You are in different classes, but they have been close friends since they were kids. Akira knows there's always been something strange about him that even he can't understand, and it is that whenever he comes to treasure something, it soon disappears. Ever since he realized this, he has made sure not let himself get attached to anything. However, the day before graduation, something happens that puts Akira's way of thinking to test.

(Source: Tokyo Mangasha, translated)