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!
All the perverted Issei wants is to squeeze bountiful boobs all day long, so he's thrilled to join Kuou Academy, a once all-female high school filled with gorgeous girls. But little did the boy know that after finally getting a girlfriend, she'd turn out to be a fallen angel who'd drive a lance through his heart, killing him on the spot! Luckily, the beautiful and busty Rias, his popular classmate who's actually a demon, revives him under one condition: that he'll become her servant. Now, Issei finds himself in the middle of a fierce chess game between demons, fallen angels and exorcists, and the fates of his new friends lie in the balance!
Both have a supernatural monsters in it. Rosario+Vampire is more about a Harem where a normal kid is surrounded by a bunch of girls who are monsters. High School DxD is about a boy who gets turned into a demon by a girl. Both series have lots fighting in it.
Very similar surroundings and story. Both are in "schools", one's got Demons (Highschool DxD) the other's got Vampires, Succubus etc. (Rosario to Vampire).
Both are ecchi although Highschool DxD beat Rosario to Vampire with quite a bit in terms of.. visuals. There's most definitely romance in both of the animes, but you're going to have to see how it goes for yourself. :)
Both anime have similar plots to the relationship. In each case the "Man" is a unique indivdual who is the only one that can be present with the givin situation. In infinte stratos Ichika Orimura is the only man on earth who can pilot an IS system, while in Rosario Tsukune Aono; is the only male human attending the school. In both anime the relationships are very very blunt, but its worth a watch to get a chuckle in.
Both anime have a male protagonist, surrounded by girls fighting over him. The feeling is similar in both animes, tho a bit different. The hillarious situations that Tsukune and Ichika get themselves into are always embarrassing and that's what makes them funny and makes you laugh. I recommend watching both animes if you like comedy and school-like anime.
Both of these series involve a variety of half human characters who band together and become friends. They are all trying to fit in with humans by going to school and doing other human activities.
Both Inu X Boku SS and Rosario to Vampire share many similar plot points such as: They both deal with monsters in human form and their relationships, they both have a comedic element to them as well as a romance element, and they both discuss the part monster/part humans relationships with regular humans. I would definitely give one a try if you like the other. Inu X Boku SS does have a bit more romance than comedy though, while Rosario to Vampire is a little more comedy driven.
Takasu Ayako can handle anything; duels with foreign powers and assassination attempts don’t faze her. But can she handle falling in love? Fellow students at the prestigious school for Beatrice users are shocked to hear that their "Angel of Death" Ayako, who has never even shown a smile before, has fallen in love at first sight with the diminutive freshman Yoshimura Mamoru. Mamoru must decide how to respond to the sudden confession of love, the resulting fascination of his fellow students, and the dangers of being near Ayako. Will his own powers ever measure up?
In Both shows main heroine is a powerful being, able to easily destroy any enemies, that devotes herself to protecting main protagonist who is weak.
Also in both cases it's a romance between highly renowned lady and a commoner.
Due to his parents' work, Riku Aoba is about to transfer to Tsumugino Private High School; but it's no ordinary high school! Unlike other student bodies, Tsumugino's academic system has a great deal of freedom; and as a result, Riku is often dragged into various schemes the student council has created, resulting in him being chased around the school for a prize reward. To make matters even more complicated, three of the most popular girls in school are falling for him. With such a busy school life, how will Riku survive?!
The main characters, Aoba and Tsukune, both share a shy and timid nature,yet end up surrounded by beautiful women. Their character design is the same and they both end up thrown into a new highschool, each very different to what Aoba and Tsukune have experienced before. Rosario to Vampire does have a more ecchi and choppy storyline, while Tokimeki Memorial focuses on the romance and plot line, if you enjoy one show you'll enjoy the other as well.
Tokimeki Memorial ~Only Love~ and Rosario to Vampire involve the main male characters taking on a role as shy personalities. While in a high school setting the characters unexpectedly get surrounded by a variety of beautiful women.