Kimi to Ita Mirai no Tame Ni

In this drama, Tsuyoshi goes back in time from age 22 to 18 (high school) by accident. He seemed happy about the do-over chance the first time, though. (My friend and I disagreed on whether we would go back in time to high school given the choice. He thinks it would be dead easy, knowing what he knows now. But I think it would be dead boring! And also restrictive, ugh.)

( And he keeps being sent back over and over! )