Cos Ro 3 - Version 2.03 + DLC (English) by H.H.Works.

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A long time ago, but relationship was good, brother and sister of the relationship now is that awkward.
One day, Shuyoru brother get to show a single photo from bad company at school.
Cute girl was the cosplay was reflected one person in there.
...... And hear the details to sister of Akane while I think have seen somewhere.
At school! In the event venue! In the city! Anywhere freely exposed play!
Sister in touch and physical contact!