About the fact that I unintentionally raised my sister to be a cripple

Raku Sakakihara lives in the Kanda River residential area in Shinjuku-ku, Tokyo.
Having a voice actress sister and a (completely useless) system.
As the eldest son in his family, he had already developed the idea that he could only rely on himself to make his family happy when his father ran away when he was young.
However...
What was originally such a happy and stable family suddenly had two more sisters.
They seem to make their future lives complicated and restless...
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(Keywords: daily love, Tokyo, twins)