A black company employee in his 40s, Namba Kazu, died of overwork and was reincarnated to another world. After saving the world, he returns to find himself regressed to his 17-year-old self. Kazu realizes that he can use the abilities he acquired from another world and is excited to restart his life over again. However, through the help of his childhood friend, Yui, he learns of the existence of human-eating abomination called Variant in the world he was born in. Kazu knows from his past memories that Yui will die in the near future. In order to save Yui, who is on a mission to fight against variants, Kazu decided to throw himself into battle in this world as well.

The desire to stick close to her master every day, could it simply be a programmed setting?! A face deliberately designed to resemble her master's old love, was all of this a conspiracy or just a trigger? But! Wu Qing doesn't understand such convoluted matters; she only wants to make her master happy! Even in a post-apocalyptic world ravaged by plagues, she wants to stay close to her master! A loyal and innocent android dog a frail and aloof researcher cat

Suhwa's family is in crisis due to her husband's misfortune. When Suhwa's future looks bleak due to the mountain of debt that has fallen on her, the twins Sowon and Leewon who lived next door proposes a contract. "In exchange for paying off the debt, she would work as a housekeeper in their house." However, Suhwa is troubled by the contract as it requires her body rather than being an ordinary housekeeper, but decides to accept the twins' contract anyway in order to protect her young son. Although she is a married woman with a child, she gradually becomes accustomed and familarises herself with the twins....

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