A secret cohabitation life kept from Onee-chan

That day, after that stream ended──

With the support of a mysterious sponsor, an older sister and a younger brother, now a university student, are freed from financial hardship.

They were finally supposed to be able to return to a "normal life."

But one day, an "intimacy gauge" suddenly appeared above their heads.

It was a sure sign that their relationship was no longer "normal."

They cook dinner side by side in the morning, and cuddle on the sofa watching movies in the evening.

Their fingertips touch in a spontaneous gesture.

Before they knew it, their time alone together was getting longer and longer.

The "fictional love" they acted out in front of the stream camera quietly and surely transforms into "true feelings" in their everyday lives away from the camera──

Until the day they cross that forbidden line. These brother and sister's tender, little by little, passionate "romance sim" life begins now.