7 Days Report

Ryota is a high school student. He's in love with his classmate Mizuki but is constantly interrepted before he can confess to her. One day when staying late from school, he stumbles upon the fact that he and his peers are clones. With the terror of only having seven days of life, Ryota manages to escape from the experiment and into the real world where he meets his original; who is nothing like him.
(Source: RisefromBlackAshes at MDL)