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Collection of 10 short stories including:
4. A Perfect Sister Complex
5. Piledrivers and Memories of My First Love
6. HSS: His sister is envy of his girlfriend. Suddenly, his girlfriend saw them in an inexcusable position. Then she asks to join the fun!!
7. 147 Centimeters: His big sister is 147cm tall. That's why he likes her.
明るいエロス計画 147 Centimeters A Perfect Sister Complex Akarui Erosu Keikaku Cheerful Eros Project (Official English Title) HSS Onii-chan's a Worry Wart Onii-chans a Worry Wart Piledrivers and Memories of My First Love