Summer~Life in the Countryside~

Every summer, your sister's three daughters get to be a bit too much for her, so she sends them to your country home, where life is different from the big city. No one lives nearby, and there's nothing to do but relax.
Some of the activities will be fun, like karaoke, while other tasks are tougher, like gardening or working together on creating manga.
Spend time with all of the sisters to reach the finale, when the sisters go home.
Spend Time with Each Sister
Have a Fulfilling Summer Vacation

Your younger sister, Tsukino Yuzuha, is an excellent student who excels in both academics and sports. Due to this stark contrast, you, an ordinary brother, have kept your distance from her. After the school's closing ceremony, you returned home and accidentally caught a glimpse of your sister in her underwear.

"You get excited by seeing your little sister in her underwear, Onii-chan?"

However, that honor student sister of yours... turns out to be a cheeky brat!

"Onii-chan, your summer vacation belongs to Yuzu."

Now, with this cheeky brat having leverage over you, and you being at her mercy... a sweet and naughty summer vacation between the two of you begins.

Fresh off the bus home, and the busty bounty of the countryside is already there to welcome you! You thought only Shizuru would be there to pick you up, but apparently, a new arrival is big enough news to draw two more hotties to the scene.
Less than a minute in and he’s almost hit a line on a ‘hentai babes bingo card’!
Nao, a dazzling blonde gyaru, Yuu with her tanned tomboy vibe, and the sensibly stylish Shizuru, who may or may not have a secret slutty side. Now all we’re missing is a sassy Tsundere and a timid, quiet type to corrupt with perverted techniques!

I was wondering how to spend my university summer break—having no particular plans—when my roommate Akira suddenly transformed into a girl due to "TS Syndrome"!
Apparently, if you reach climax 100 times within 30 days of the transformation, your gender becomes permanent...!?
And so begins a steamy summer life with this newly minted girl...
Even though she's a girl now, she was originally a guy with a keen interest in sex;
there's no way she's going to just sit around and do nothing after transforming, right...?
Thanks to the transformation, she can experience things that were off-limits to men...
It would be a waste not to take full advantage of that female body!
Visit the women's bath, beauty salons, lingerie shops, and more!
Now that she's a cute girl, she wants to get down to business!
She wants to secretly show off her sexy body... That's it—let's get naughty on a secret social media account!
You can't do anything too extreme at first, but as things heat up, you'll be able to take all kinds of risqué selfies...
She's curious about her female body, but masturbating in front of her roommate is a bit much... better to do it secretly when alone...
You can even try out various masturbation techniques by ordering adult toys online!
With libidos running high due to TS Syndrome, and both of them being sexually curious, there was never any chance they'd choose *not* to have sex...

I live on the 14th floor of a high-rise apartment building in the city.
One day, Shiroine Touka, the most popular girl in your class, comes over to your apartment to read manga!
Apparently, in exchange for letting her read manga, she lets you use her body as much as you like...
Her breasts, thighs, anus, pussy... she'll even let you cum inside her as much as you want...!?
As you and Touka gradually become closer,
you play cards together, eat meals together, chat on the balcony, and even barge into her bathroom and toilet...!?
She'll even tell you secrets she can't tell anyone else...?
An immersive 3D after-school simulation game.