Koenchu! Voice Actress Tale ~You, the sky and summer~

After being dumped by my girlfriend due to poor sexual skills, a familiar-looking Japanese girl transfers into my department.
 
To my surprise, she turns out to be an active AV actress! Not only is she willing to teach me how to improve my skills, but she also encourages me to hook up with others to gain experience.
 
With things coming this far, there’s no turning back—I’m determined to master techniques that even an AV actress can't handle.

The Human Realm and the Demon Realm. These two worlds connected, and for hundreds of years, a brutal war has raged.

Alice, humanity's strongest warrior, receives a military order to leap 200 years back in time. Her mission: to vanquish the Demon King, who is said to be the root of all evil...

The guests at Sky Resort are buzzing with excitement, their bodies and desires pulsing with anticipation, eager to take the fun to the next level!
 
Dive headfirst into a world where pleasure knows no limits, following their steamy, lustful adventures. At Sky Resort, the heat never cools, the sex never fades, and the naughty times are only just beginning. From passionate encounters under the stars to intimate moments behind closed doors, every fantasy finds its release in this haven of untamed desire!

Residential areas, farmland, and mountains in the distance. Although it is hardly a remote area
It can never be called a city. It is a country town that can be found anywhere.
The protagonist returns there at the height of summer and takes a job as a live-in temporary worker at his former alma mater.
He takes a job as a live-in janitor during the summer vacation.
There, he meets his niece, Takanashi Takanashi, who has moved there after her parents’ divorce.
Otsuwa (Takanashi Otsuwa), who moved there after her parents divorced,
Rino Akatsuki, her older childhood friend.
Rino Akatsuki, her older childhood friend. Otoha is a transfer student taking remedial classes,
Rino had to attend school during the summer break for club activities.
They used to play together as babysitters in the past.
The relationship between the three reunited girls was not the same as it had been back then, but had changed slightly.
Was it simply because they had grown up, or…?
A chance encounter with Otowa and Rino,
The protagonist begins to develop a special relationship with Otowa and Rino.

It may have been the curse of the black lilies that bloomed early in the winter--.
It has been 18 years since the new and threatening virus "CLII," which killed more than 50% of minors, was completely contained.
People have completely regained their normal lives, but it has left a huge mark and problem in the society....

A girl who has yet to realize its impact, Sasamori Hana, is a third-year student at Naeshiro High School in Sapporo.
She is a quiet girl, but inside she always feels anxious.
With only a few days left until graduation, Hana finds herself repeating the same day over and over again.

"Ah... that's right. I like Itsuki-chan..."

Hana strongly wishes for the happiness of "Itsuki-chan" who saved her in the past.
She's not even exaggerating it, she would do anything to make it happen.
But she thought the second time, "no, my feelings won't make her happy..."
She thought it was something she shouldn't admit, and it would just ended as "a whim of puberty."
However, that realization led to a deep, deep "curse"....

This is a story of love that weaves between two people in order to persist through such "love" and "curse."