Tokuyama Takehiro is a young game programmer who has taken on his first big project as the lead programmer. Not only that, he is also pulling double duty as the project's director. He finds the stress of his first big project overwhelming and he ends up using food as solace at a local okonomiyaki shop. There he meets a precocious young girl who seems to take an instant liking to him and seems to know far more about him than anyone should, except perhaps... his dead mom?

(Source: Mangadex)

Keita has two older (not blood-related) twin step-sisters who love him in a lustful way and have no problems expressing it. They even like to compete about it; much to the laughter of his friends (which he usually endures without problems). One day they come to his school to give him his lunch, resulting in him getting angry due to the atmosphere. To counteract his anger, they confess their tender feelings for him in front of everyone and leave. Feeling sorry he chases after them and says that he'll study hard in order to get in the same high school as them.

Meet Plug, an unusual girl from a parallel world. Plug is a "Juuden-chan," capable of "recharging" people down on their luck, spreading good cheer wherever she goes!