Shokushu Ouji no Nikuyome Sagashi ~Haha to Kyoudai no Owaranai Zecchou Jigoku~

Even after losing her husband at a young age, the mother, Fuyuko, has continued to live happily and with the children he left behind.
The children, who are not sisters the same age but actually siblings, support their mother and live together in harmony as a family.

One day on the weekend, the three of them enjoyed a casual lunch at a small family restaurant near their home.
Before leaving, Fuyuko gone to the bathroom to fix up her makeup.
Unfortunately, it was a small bathroom with no mirror in the sink.
After entering the stall, she realized also that she didn't have a hand mirror in her makeup bag.

With no other choice, she started applying makeup while looking at the black screen of her smartphone, but suddenly, a tentacle reached out from the phone...

[From Getchu]