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Neon traveled to a parallel world. Living a difficult life alone. Everything was excruciating. But later Kimura Yu discovered that it would be good to join Kurosaki-senpai's club to make games and write light novels to make a little money. Of course, the most important thing is that Yu Kimura has a lovely sister by his side. This book is also known as "My Cheating Dad Left Me with a Half-Sister", "The Plan to Save My Sister", "How to Make My Sister Act Like a Baby", and "I'm Really Not a Sister Controller".

Takeshita Ryosuke inexplicably traveled to another world for two years. When he came back, his single father had remarried, and his remarried partner also had a daughter. That daughter is still a popular idol. "What? You're going on your honeymoon? So you're leaving her in my care?" Originally, Takeshita Ryousuke thought that taking care of a peer was no big deal. Until he discovered that another girl who formed the idol group turned out to be a half-demon vixen.