A Decade of Rocket Launchers

If one day, while you were sunbathing on the beach... A stupid cow suddenly came running over and took a hard tumble... Then it lay on the sand, tears streaming down its face, clenching its fists and saying, "I have to endure! Lord Lambo doesn't cry! I have to endure! Waaah!" Then it burst into loud sobs again. From the hair on its head, which seemed to contain some kind of unknown space, it pulled out a rocket launcher, lit the fuse, and tried to climb inside... Only to take another hard tumble... The rocket launcher ended up pointed right at the head of Oshitari Yuushi, who had been sunbathing on the beach just for fun and now regretted it so much he could have kicked himself... Bang! Oshitari Yuushi transmigrated He went ten years into the future Theme: