White-collar worker Gotou Shizuka is attacked by a slasher who suddenly appears in the heart of the shopping district. Just as she is lost to her wounds, she hears a voice ring in her head. "You have been defeated. Commencing termination countdown." Due to the counsel of the "Night Guide (Guidance)," she narrowly escapes death and awakens with an ability that ordinary people do not possesses. In the same instance, this world became connected with another and monsters begin to spring forth… Gotou makes a decision to fight against these monsters. With her positive nature and bold and carefree attitude, she throws herself into the heat of the battle while leveling up and making weapons.

Late one night in the school building, Kamishiro Yukisuke, who holds a healing power, had an encounter with Kuroto Satsuki, who was fighting a strange zebra-man. Unknown to them, the two ability holders were bound by fate. A bad sensed murder occurring at the same time, a hamster that can speak, a half invisible younger sister and a spaceship crash. After finding out about the two power holders, a classmate Okuda Emi invited the two of them to the 'Occult Research Club' where many individuals gather. A screwed up love story between 'the boy that won't die' and 'the girl who would unconditionally kill.'

Ichita, a hard-to-hit fireballer, Yutaro, a kind but simple-minded catcher, Amamiya, a tall pitching prodigy, and Hinami, a cool, calm, and intelligent catcher. The fates of these four players intersect, each with their own ambitions! What combination of the four will become the most effective battery...!? (Source: Champion Cross, translated)

The protagonist is "Uncle Arafif," who broke his body and retired after working as a cogwheel for a black company for many years, went to an auto camp to spend a leisurely time after winning the lottery he bought at Yakeso. "However, I was suddenly blown into a different world and got a rejuvenated body and a lot of cheat skills!" Making full use of the items brought in from the present age, the ex-old man will remake his life as much as he wants.

5 years ago, Haruki's brother Hiroki was swept away by the raging river when the bridge Haruki had built broke, and Haruki believes he is responsible for his death.