In the world, there are those who hunt down rare and powerful items known as Lost Precious, including Ryuuji Kisaragi’s own parents and cousin Erika, who’s been studying abroad for the last few years. But when Erika suddenly returns, the boy finds himself in the middle of the action when she drags him along to intercept a special treasure from the nefarious Fang organization. What’s more, the duo soon discovers that this Lost Precious isn’t a jewel or trinket, it’s a rare dragon girl who instantly bonds with Ryuuji! Now, Ryuuji and Erika must help teach this dragon - who they name Rose - about the world, while keeping her safe and meeting other new friends and dragons along the way.
Metropolis is a grand high-tech city-state populated by humans and robots alike. It is in these streets that Detective Shunsaku Ban and his sidekick Kenichi search for the rebel scientist Dr. Laughton who unbenounced to them, is developing a super android named Tima as a tool for the Duke of Metropolis. What starts out as a normal case turns into mayhem as the scientist is murdered, and the true plans of the Duke are finally revealed...
Both animes feature the main hero stumbling upon a meta-human blonde heroine with a limited vocabulary, who becomes attached to him.
They both focus on the mysterious origins of the female lead while addressing how she adapts to society and is involved in the happenings around them.
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?
It starts with one girl. The comes another. You know where we are going here.. One guy has a collection of girls which keeps on growing as the story progresses. Both have heavy supernatural elements as well.
If you liked one, check out the other.
In a world where magic is a reality, the young Louise is at the bottom of her class. Dubbed "Zero" by her classmates at Tristein Academy (due to her zero success rate for magic), Louise (along with all first year students) was charged with summoning a familiar; and instead of a cute magical creature, the familiar arrived in the form of... Saito Hiraga, a normal Japanese boy who was abruptly teleported from his own world?! Can both Louise and Saito come to terms with their new and complicated "relationship" and (more importantly) help Saito find a way home?
Dragon Crisis and Zero no Tsukaima not only share the same female lead actress, they both offer a decent amount of action. While Zero focuses more on harem, both series revolve around a boy whose life is drastically changed by a mysterious girl. Zero tends to be more risque than Dragon Crisis but both are an enjoyable watch with good endings. Both focus on magic, fantasy, harem, and love.