If you liked the Lovely Complex anime, the Anime-Planet community thinks you'd like:
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?
The story is pretty different from "Lovely Complex", but it's as funny and the two main characters are kind of like the ones in this show. The guy is really short and so, the girl is taller than him. The personalities of the characters in "Mamoru-kun ni Megami no Shukufuku wo" and "Lovely Complex" aren't the same, but the comedy and the romance are top-notch. Plus, some students can control a power called Beatrice and each episode made me laugh like never before + it has a plot (it's not completely mindless laughter).
If you don't mind the main characters not having as much trouble with their relationship as in Lovely Complex, lots of action and endless comedy, then you should watch "Mamoru-kun ni Megami no Shukufuku wo". Also, the ending is really sweet (and hilarious).
Due to his upbringing with a wrestler mother and an equally-as-strong sister who beat him up constantly, Kinjirou Sakamachi would rather die than be touched by the opposite sex. So when the boy accidentally discovers that the dreamy school idol (and butler of the wealthy Kanade) Subaru is actually a girl in disguise, Kinjirou finds his life becomes far more complicated. For in exchange for keeping Subaru's gender a secret, Kanade is determined to cure Kinjirou of his gynophobia, with Subaru's help, once and for all...
Yuuto Ayase is not interested in girls - if his two housemates are anything to go by, girls are loud, brazen slobs that are best left alone. However, when Yuuto accidentally discovers an important secret of his school’s most popular female, Haruka Nogizaka, the two become bound in a budding friendship. All too soon, Yuuto discovers that, despite her flawless appearance, Haruka is clumsy, naive, and a closet otaku... and he just might be falling for her.
When Ritsu was in high school, he fell in love with a boy who broke his heart, changing his view of love forever. Now a jaded adult, Ritsu has just transferred to the Marukawa Shoten company in hopes of publishing literature, only to be told that he'll be working in the shoujo manga division instead. What's worse, his boss is brash, rude and seems to have an interest in him! However, the biggest surprise is yet to come for Ritsu, as he soon discovers that his boss is none other than his lover of his past!
Both animes have similar, little naive atmosphere, making them very likeable, although there are big differences since in Lovely Complex main characters are high-schoolers (girl and a boy), and in Sekai-ichi Hatsukoi are two adult men.
But, all in all, if u like romance (in all variants), good voice actors, and interesting (in rolling-on-the-floor-and-laughing kind of way) facial expressions and characters reaction, then these are animes for u!
Kaede is a devoted high school student who lives with her adopted brother Rin. She holds a quiet confidence that one day, when Rin finally starts showing interest in sex, he will make the obvious choice and turn to his loving sister. But what Kaede wasn’t counting on was the lords of heaven and hell coming to Earth, wanting Rin to mate with their nubile daughters! Rin, like any teenager would, takes full advantage of his newly acquired harem; but how long can he keep up his carefree, boxed-lunches-on-the-rooftop lifestyle, as the horde of girls on his tail grows?
Some people need to be smacked in the face with love before they realize how deeply they've fallen - literally! Both Lovely Complex and Shuffle are about a quest for love and the heartache between unlikely pairs. Shuffle! holds more of a harem mentality, but the wild antics and heartfelt sentiments are similar features for both series.