From the System With Love: A Quick Transmigration Story [Level 1‪]‬

Felicia died and somehow got selected for a job fixing dimensional errors. Helping her complete her tasks is a strange machine-like being called DARS. Follow her as she makes her way through 10 different dimensions and slowly discovers the real reason behind her "selection".

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In Level 1, How to Raise a Cold CEO: Darius King is an essential person to the timeline, introducing new technology that changes the course of history. Felicia's mission is to keep him away from Janice and Jenny, two women who will fundamentally alter his life if they meet and cause a cascade affect that will eventually lead to existence itself imploding. It's just... why is Darius King, the oh-so-important-person, a strange little kid? And why is she, Felicia, now his older sister who is also a child?!

Unable to return to her own world, Felicia must relive childhood again (and all the school work that goes along with it), while somehow also forcing her "brother" to grow up to be less... well, weird!