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Yukito's parents are the leaders of a cult. After he gets sacrificed, he gets reincarnated into another world where religion doesn't exist and porn books are akin to a child's doodles. He finds that it's also a world where your life and death is decided by the country. While obstructing his friend's execution, both of them lose their lives. Just at that moment, the god of his religion comes to their world and revives them.

Sixteen-year-old Ai Hoshino is a talented and beautiful idol who is adored by her fans. She is the personification of a pure, young maiden. But all that glitters is not gold. Gorou Amemiya is a countryside gynecologist and a big fan of Ai. So when the pregnant idol shows up at his hospital, he is beyond bewildered. Gorou promises her a safe delivery. Little does he know, an encounter with a mysterious figure would result in his untimely death—or so he thought. Opening his eyes in the lap of his beloved idol, Gorou finds that he has been reborn as Aquamarine Hoshino—Ai's newborn son! With his world turned upside down, Gorou soon learns that the world of showbiz is paved with thorns, where talent does not always beget success. Will he manage to protect Ai's smile that he loves so much with the help of an eccentric and unexpected ally?

Unaired episode included with the Blu-ray box set.

Second year high school student Ichirou Satou has always been an average person—that is, until he runs into some not-so-average situations with his teacher, Kana "The Demon" Kojima. Kojima is Satou's Japanese language teacher with a reputation for being so ruthless that even school delinquents bow down to her. One fateful day, things escalate when Satou runs into Kojima in the restroom, leading them to share an intimate encounter that makes his imagination run wild for days after. Nande Koko ni Sensei ga? follows the daily life of Satou and his teacher as they continue to meet under similar conditions, growing ever closer with each encounter.