Baka na Imouto wo Rikou ni Suru no wa Ore no XX Dake na Ken ni Tsuite
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To overcome his attraction for his younger sister Hana, Yuuichi Mitsui made sure to enroll at a university far away from his home. Unfortunately, being separated from her only strengthened his feelings. He continues to feel guilty for harboring illicit thoughts when suddenly, Hana shows up at his doorstep on a summer morning, looking more beautiful than ever. However, despite her physical maturity, her intellect is that of a child. Consequently, Yuuichi tries to hold back from laying a hand on his innocent sister. But it is easier said than done, especially when Hana's ignorance—combined with her innocence—makes her a woman that Yuuichi can't help but desire.
Yuichi Mitsui, an ordinary college student, is currently living alone to attend college. One day, his beloved sister visits Yuichi during the summer vacation. His younger sister, who he saw for the first time in two years, has a developed a plump bust of loveliness. Besides her grownup appearence sister, Hana, is still ... a ridiculous idiot. If she walk three steps, she will forget everything she learned, she can hardly read kanji, and she cannot operate the remote control with three or more switches. Yuichi decides to follow the thorny path in order to raise his younger sister, into a fine adult.
