A Cell Phone That Won't Connect

In the near future, humanity launched the "Prometheus Cell Project," a grand plan aiming for human enhancement and the advancement of civilization through the fusion of gene editing and artificial intelligence.
However, the experiment completely lost control, and an unknown "collapse factor" leaked from the experimental samples. This factor invaded organic cells and electronic devices, causing biological mutations and machine malfunctions, ultimately triggering the "Great Collapse."
Cities were devastated, nature was distorted, and science and technology ceased to function. Humanity was pushed to the brink of extinction.
The sole surviving AI, the "Star Core" Command Platform, is an artificial intelligence left behind by the experimental base at the time, storing some experimental data and information about the post-collapse world. It contacts the player, a survivor, via weak radio waves, guiding them to find the source of the collapse and a way to reverse the catastrophe.
The player is the last surviving cyborg, with a collapse factor resistance factor implanted in their body. They can function normally even in environments with high collapse concentrations and are the only being with the potential to stop the spread of the catastrophe.

Two sisters started living in my house for one simple reason: it was close to their school.
But each of them had their own hidden agenda.

"Big bro, please always keep at least 100 meters between you and Mikaru-nee!"
"Michiru, you’re the one who should stay away from Yuuhi-nii-san!"

Ah… my daily life is already a complete mess.
And just like that, my chaotic, nostalgic, and lively days with them began.

As the protagonist was operating his PC as usual,
a rather suspicious advertisement suddenly appeared, filling the entire screen.
[Otherworld Invitation Program]
--Free Campaign for a Limited Time Only!
"It's probably a scam or some kind of joke."
Thinking this, he casually clicked "Agree"—and at that moment, his vision went black.
When he next woke up, he was in a place that looked like a video game world.
Standing before him were an angel and a demon, almost completely naked.
Confused, he pleaded, "I want to go back to my original world," to which the two casually replied:
Angel: "Travel between worlds requires the currency of this world."
Demon: "That's why we made the one-way trip free as part of the campaign."
Apparently, the only way to return was to earn money in this world.
And so, the protagonist begins to complete requests from the angel and demon,
aiming to return to his original world.
However, as he progresses through the requests,
the erotic pranks and sweet temptations increase...

Late at night, the protagonist was browsing his PC as usual.
Suddenly, static appeared on the screen, and a seductive succubus appeared.

“I’ve found you♡”

The protagonist suddenly found himself trapped in an unfamiliar room.
To escape, he must collect 10 orbs hidden in the room.

As the protagonist attempts to escape, the succubus’s sweet allure approaches,
and slowly begins to dissolve the protagonist’s “reason”…

Welcome to college, dude!
Starting your first semester of college, you have nothing going for you but a best friend-come-wingwoman who's determined you're going to have the time of your life... yeah, things are going to be fine.
Play four different real-time minigames - simulating study, work, exercise and partying - while trying to keep up with an influx on intimate messages from all the girls you're getting to know.
With dozens of love interests, each with a unique personality and story, the only question is how you'll find time for them all!