Bitch Nee-chan ga Seijun na Hazu ga Nai! [ADV][Japanese]

Description:

Ebina Tsukushi is just a normal high school guy who doesn’t stand out in his class at all.
He wished that despite being distanced from his childhood friend Fujikawa Himawari, he would have hope for his love life in the future.
But even when he tried inviting her to walk together from school with her, she only told him, “It would be embarrassing if there would be rumors about us being close”, slightly crumbling his heart. Even when he confesses to her, he gets completely dumped, and becomes very depressed.

However, on the same day he got rejected, his very confident and popular older sister Nadeshiko, who has been studying abroad, returns back home!
Wanting to be as confident as she is and live a fulfilling high school life, Nadeshiko, who is also very brocon, just tells him: “Leave it all to me!” After a few days, he finds out that she has planned something together with the school’s haraguro nurse, Ayame:

With the power of his powerful and big dick, he will conquer the hearts of his schoolmates, including a teacher’s, and create a harem. With the help of both Nadeshiko and Ayame, Tsukushi’s unexpected harem life begins!