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Fifteen-year-old Tsukune Aono is average in every way; he has no hobbies, less-than-stellar grades and he's even flunked his high school entrance exam. His parents have managed to enroll him in a school, but it's no ordinary school! Tsukune will be attending the Youkai Academy, a place where monsters learn how to co-exist with humans! As the werewolves, vampires, witches and other monsters are required to retain their human forms, Tsukune - the lone human - is able to avoid their bloodthirsty gazes. However, he quickly attracts the attention of a number of devilish beauties including the vampire Moka, a busty succubus and even a young witch! It seems Tsukune's average life isn't so average anymore!
Yuuto Amakawa has had a tough life. Seven years ago, both of his parents were tragically killed in a car accident, leaving him without a single living relative. His friend Rinko Kuzaki has taken care of him every since. Yuuto's sixteenth birthday has arrived, but instead of a birthday gift of a normal life he meets Himari, a catgirl samurai who swears to protect him. Within weeks Yuuto's life is thrown into chaos as his family's dark past comes to light. With demons appearing around him, Rinko and Himari fighting for his attention and a sinister plot beginning to surface, can Yuuto live the normal, safe life he wants so badly?
Besides the fact that both animes are bombarded with countless ecch scenesi and having that one annoyinng close friend, both animes are about a protagonist who meets a woman of a different "species". Meeting them sheds a new light on the protagonist and they have to conquer the endeavors that come with it.
One day a light descends from the sky and splits into the ideal girls of Takeru and Ryou. That is where this gentle and vaguely romantic story about our ugly and beautiful world begins. Soon enough the story plummets into the secrets of global extinction and the meaning of life. Everything in this world that is beautiful has something ugly in it, and that ugliness is part of the secret of its beauty. Even for romance this is true...
Both animes revolve around a young adolescent who meets a celestial being that literally fell out of the sky. While trying to deal with their newfound companion, they also have to deal with the jealousy of a girl from their past. While Sora no Otoshimono focuses around a comedic, ecchi aspect, This Ugly Yet Beautiful World is more of a romantic comedy.