Summer In Trigue

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.

Enomoto Ryoka is a childhood friend and the ace of the girls' basketball team.
They grew up together in a rural village, and she was the girl he secretly loved --
 
What kind of acts did she endure?
 
How did those filthy men connect with her body?

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.

Our protagonist, Yuu, ends up spending his summer vacation at his relatives’ house in a rural town.
He is warmly greeted by the three sisters who live there.
When he meets the sisters for the first time in a long time, they have become very interested in sex, and the same can be said for our protagonist, Yuu.

The plot of Natsu no Ame revolves around Sousuke, a soccer loving idiot who spends his days practicing with his two friends, Takeda and Midori for the day when he is allowed to return to the soccer club he was forced to resign from.

The story begins with Sousuke recalling a memory from his past where he pondered what qualifies as a first love, thinking about a young girl he teased almost to the point of tears as a child. Upon snapping back to the present Sousuke is made aware of a beautiful girl busy with her cellphone. After knocking her out of the way of on oncoming motorcycle he finds that he had also sent her cellphone into the river.

Being the nice guy protagonist that he is Sousuke then goes into the river to find her cellphone, however when he gives up and she tries to help him out he ends up pulling her in as well. First impressions aside he then finds out she wanted to know where his school was as she had just transferred in. Undaunted by his earlier screwups Sousuke decides to be a man and instead takes her on a tour of the town before finally dropping her off at school. In the end it seems he managed a favorable impression afterall!

Upon returning home he finds the very same girl in his home… where his mother informs him that she is his long lost half sister!