When Hayate was young, Santa appeared in a dream and told him that if he worked hard, he’d be rewarded. Thus, with an unbreakable will, the unfortunate Hayate has struggled through life holding onto that belief. In the present, his parents are lazy and unemployed, forcing Hayate to work several jobs to pay the bills. As if things couldn’t get worse, Hayate’s parents then run away, leaving him with an enormous debt and loan sharks on his tail! Naturally, the best solution to find money fast is… to kidnap someone?! A girl named Nagi is the target, but due to an unfortunate miscommunication, she believes Hayate has proposed to her and falls for him hard. After Nagi paid off his debt, Hayate must now work as her butler in order to repay her; but first, he must adapt to her wacky world!
Ever wanted to join an anime club but felt its geekiness would hurt your reputation? Sasahara feels your pain. Genshiken, the Society for the Study of Modern Visual Culture, is an organization of college otaku obsessed with anime, manga and video games. Their daily activities include holding impromptu cosplay photo shoots, braving the crowds and avoiding injury at doujinshi conventions, and tolerating harassment by Saki, a girl irked by her boyfriend's otaku-ness! It's a perfect match for Sasahara's interests, so why is it so difficult for him to join?
If you like one of these animes you may like the other one, while genshiken is more realistic and shows the realiity of otakus and doujins, hayate no gotoku is a lot more about fights and humor but they have in common thet they are constantly making parodies of various animes, also you'll find some love relationships on both animes and how these relationships grow up.
The average Tsukushi Makino attends the snobby, elite Eitoku Academy, which is dominated by the Flower Four (F4) – the sons of the most powerful families. Like the rest of her classmates, Tsukushi keeps a low profile until one day she can stand it no more! For her obstinance, the F4 declare war and it's Tsukushi against all. In the middle of it all, she finds herself drawn strangely close to two of the F4; they might not be as bad as they seem. With her heart torn between two boys, will Tsukushi be able to find the love she desires?
then again, these two series deal a lot with the differences between rich people and not so rich people. Also the main characters, the boy in Hayate no gotoku and the girl in HYD, have sometimes to pay huge debts or need money to live on and the rich person always help them out. Also the personalities are very different, the rich guys always get what they want that's why it's hard for them to understand each other. If you add to this the love story and the continous twists and misunderstandings, you get that both animes are very similar, you'll surely like one if you liked the other, though hayate has a lot more of comedy.
The Kawahira family specializes in dealing with troublesome spirits with the help of inukami, strong dog spirits that take human form. Members of the family are expected to make pacts with strong inukami in order to fulfill their duties, but their family has a black sheep: the perverted Keita, who charges people for his help. His inukami, Youko, is dedicated to make Keita completely hers. Her favorite form of punishment for him when he strays is teleporting him into the city completely naked. He's been arrested for indecent exposure so many times that he's a jailhouse regular, and is considered an outcast by his family and normal society; yet an inukami of the highest caliber chose to be his partner?! Is there really more to him than perverseness?
Ayumu was murdered by a serial killer – at least, he was. For after the mysterious Eucliwood Hellscythe revives him, he changes from a human to a zombie, much to his dismay. Now, in addition to being unable to die, the boy must see to the whims of his supernatural, silent companion – but things continue to get worse from there. As once Ayumu accidentally steals a magical girl named Haruna's powers, he is tasked with the embarrassing, obnoxious task of being a magical girl – err, boy – in her stead! Then with the addition of a hostile vampire ninja to his household, can Ayumu manage to maintain his new home life, fight against attacking monsters, and track down the person who killed him all while attempting to keep what little dignity he has left in tact?
To make money, high school student Shinkurou Kurenai works for the secretive Benika as a "dispute mediator," acting to intervene in the disputes of clients – often violently. One day, Benika gives him a much different assignment: to protect Murasaki Kuhoin, a seven-year-old girl from the wealthy Kuhoin family. This turns out to be a more troublesome task than he expects, as Murasaki is spoiled, naive, and completely unaware of what life is like outside of the luxurious one she had previously. He also has no idea why Murasaki needs his protection, though he is slowly obtaining details from a well-informed classmate. Adding to his problems, Shinkurou still must continue to do his previous work for Benika and take care of his social relationships in school while protecting Murasaki, complicating his entire life. Nonetheless, as time passes, he and Murasaki grow close; however, trouble brews in the shadows as everyone - including Shinkurou - seems to be harboring secrets...
It seems a sort of absurd comparison, but I think that these two shows are similar in enough ways to find enjoyment in both if you like one. On one hand, Hayate is mainly a comedy and Kurenai mainly a drama, but the idea of taking care of a young naiive girl stands prevalently in both. Both Nagi in Hayate and Murasaki in Kurenai have that quality of naiivete in the same way and I think you can draw enough parallels between them to enjoy both shows.