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Doushin: Sanshimai no Etude
同心～三姉妹のエチュード～
Meet the Suruga sisters: Ryoko, Maki, and Miho. Ever since their parents passed away, they have been living together, supporting each other and never feeling lonely because they have one another. The three sisters share a very special secret: due to an unexplained physical phenomenon, any sensation felt by one sister is instantly shared with the other two, no matter where they are.
If one sister pricks her finger, the other two feel the same pain. And if one of them becomes sexually excited, the other two immediately experience the same emotions, regardless of their current situation. As they go about their daily lives, each girl never knows when she will be suddenly aroused by the feelings of her siblings, leading to bizarre and unexpected consequences for all three.
