Imouto to Kanojo - Sorezore no Sentaku | 妹と彼女それぞれの選択

There is no way to stop once you start falling in love.

The world didn't know, but there were siblings in love. The little sister wished "I want to be anyone but his sister". At the same time another girl, who looked just like her, thought "It would be nice to be his sister".

And then... The two girls met each other.

June, the rainy season. Kei, a fourth-year college student, is at a major crossroads.

Since the day of the fireworks display that interrupted the confession from his younger sister Haruka, the relationship between them has gone cold, and still remains in this way for three years.

To become truly happy together―― Until the "Answer" is found, there is no way to respond to his sister's feelings. While desperately holding back the feelings for his sister, Kei continues to act as a "good older brother". On the other hand, Haruka is acting coldly towards her brother, who does not respond to her feelings, despite being aware of each other.

As the rainy season continues, Kei's worries deepen. To become truly happy together―― If he can find the "Answer", he should be able to respond to his sister's feelings.

One day, as a result of consulting with his friend Daichi, Kei is reluctantly brought to a hostess club, since there is a girl whom his friend really wants him to meet. Appearing in front of Kei is a girl who could have been mistaken for his beloved sister, a face that looks exactly like Haruka. The girl introduces herself as "Mitsuki", feeling "Similar", the two of them become intensely attracted to each other.

With the appearance of "Mitsuki", the relationship between the siblings "Kei" and "Haruka" begins to change drastically.