【PC+PYMO】夏之雨｜夏ノ雨

在三桥学园就读的桜井宗介（さくらい そうすけ）。

家庭和学园生活虽上多少有些问题，身为女孩子却能像男性友人一样自然交流的女性朋友,宫沢翠（みやざわ みどり），像温柔的姐姐一样的青梅竹马，伊东ひなこ（いとう ひなこ），既是死党又是良好竞争对手的武田一志（たけだ かずし）被这些友人所包围，可以说是过着平凡的学园生活。

有一天他回到家里的时候，在家中发现了一名他从未见过的少女。

瀬川理香子（せがわ りかこ）——她这样报出了自己的名字。

彷佛向周围释放威压一样的有着凛然气质的美少女。对着盯着她出神的宗介，母亲这样向他介绍。

「这是你的姐姐哦。虽然你们同岁。」

姐姐？同岁的？

「前些日子，你的父亲过世了。」

在宗介还在年幼时就已离婚的那不知行踪的父亲。她是父亲的女儿，跟据父亲的遗言她被接到这里来领养。

「就是这么一会事，所以帮忙照看她一下。」

「要我来!?」

「当然喽，对你来说她和你是姐弟关系嘛，对于我来说就是完全没有关系的人了」

面对任性地发表言论的母亲。感到迷惑的宗介，理香子开口说道。

「只要当我不存在就可以了。我不打算给你们添麻烦。」

占据了夏天的梅雨之日。

与突然出现的美貌而的同龄姐姐的同居生活开始了。

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!

[From Zen's Review]