Little Devil Smartphone - My Flirty Harem with Sexy Beautiful Sisters

Parents trust the house to a brother and sister while they travel…

The brother and sister that were left to their own devices by their overseas
travelling parents and still at it, enjoying day after day of sexual indulgence.

Your peaceful and boring daily life as a freelance illustrator is suddenly turned upside down when your truant little sister decided to crash in your apartment to skip school.
She's a downer and the silent type. So, you decided to let her stay and take care of her for the time being instead of prying any further. And besides... this might be your chance to finally break through that cold exterior and get closer to her.
Be a good brother, and take care of your sister, all while balancing your job as a freelance illustrator. Manage your time wisely as you spend your time with her and work on the illustrations you were commissioned for.
Finish different commissions and receive money to buy several reference books and some QoL improvements for your room to make your cohabitation life with your sister even better.
Your little sister is a downer girl who needs your attention and care. Teach her how to study, cook for her, give her praise or head pats, and she will open up to you as you spend more time with her.
Easy-to-Understand Simulation Game
Manage your time wisely between your job and spending time with your little sister. You can talk with her, teach her how to study, and even give her some encouragement. However, don't forget to do your commissions for your job so you can buy things and increase both your and your sister's quality of life.
Three Different Difficulties
Choose your preferred difficulty between easy, normal, and hard. The higher the difficulty, the more careful you will have to be with how you manage your time, and the less forgiving both the game and your sister are for any mistakes.
Beautiful Monochrome Graphics
Experience what it would be like to step right into the pages of a manga with stunning black-and-white hand drawn graphics that are sure to be an unforgettable experience.

This is the story of a brother who is a substitute teacher at a school and his sister who is a student at the same school.
His sister, Jurina, is a bratty and unruly girl who is always a headache.
One day, when she hears a rumor that the protagonist is getting close to a fellow teacher,
she confronts him and, ignoring his wishes, forces him to ejaculate.
After filming him in an embarrassing position, she says to him…
“From now on, I’ll be your ejaculation manager.”

On the way home, I happened to find a cat girl and decided to let her live in my house for a while. I'm completely smitten with her cute, tsundere personality.