Hatsune. Time Travel: Light Picking Assassin

One is a bad student who sleeps in class all day and goes to an Internet cafe all night after school. One is an unconventional and eccentric history teacher, Who is it that unintentionally opened the door to time? Who, through time travel, has transformed into a mature and calm industry giant? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.