I came across a mysterious notebook. It's a device that says that if you write a date, time, and place, you can actually go back to "that place." Though I'm skeptical, I decide to go back to that day when I was just one step away from having sex, but I couldn't. That day when I was alone with that girl from the swim team in the locker room, but I got scared and couldn't finish, so I just ran away; that day when we were drinking at home and we were all sleeping together, so I couldn't make a move; the day after school when we were caught in a sudden downpour and left alone with a drenched classmate; the days when I received devoted care from the woman who was the perpetrator of a car accident...there are so many missed opportunities. But with this notebook, I can go to another world line that I couldn't choose that day! This time, I'm definitely going to do it!