Main character is a normal school student. He sleeps during the history class and gives the wrong answer on the question. In the night he slips into the school to correct the mistake, but the answer is already input in the computer. When he messes with the computer he arrives to 1169 year, the events before the Genpei War. If he can't fix the answer, he will change history instead to fit the answer!
more...
很无聊,男主穿越回800年前去攻略mm,结尾又把老师静香上了一顿