Okay, now that we've got a little bit of a history lesson, it's time for us to get back to the present. We're going to find out what happened between Tamura and Shimada in the past, and then we'll figure out what's going on with Tamura now that he's got the power to travel back in time. Tamura wants to make sure that Shimada doesn't know about it, so he tells Shimada that he was reborn into his new self when he was in high school. Shimada is all, "Oh, yeah, that's cool." Tamura says that if Shimada can remember something from the past that left an impression on him at the time, then he can go back to that exact moment in time and relive it all over again.