Yoichi Karasuma is a strong young samurai who was born and raised in the mountains. One day his father decides to send him to the city to stay with the four Ikuraga sisters so that he can gain valuable life experience, but his first trip into civilization doesn’t go quite as planned. Not only is he late to meet his new hostesses, but he is labelled a pervert and manages to get himself arrested – twice! Now, as he lives at the Ikuraga Dojo with Ibuki, Ayame, Kagome and Chihaya, Yoichi must adapt to his new life at school while accepting the rather violent ‘training’ he receives from Ibuki. After making an enemy of the school delinquent and with a mysterious man after his life, it seems that Yoichi’s quest to gain life experience won’t be so smooth after all!
Tenma Tsukamoto is young, bright, and smitten with the school hottie Oji Karasuma. She's desperate for his attention, which is unfortunate considering he barely gives her the time of day! Throw Kenji Harima, the school delinquent with a crush on Tenma into the mix and you've got one twisted love triangle of unrequited proportions! Can love find the trio happiness before their attention-grabbing stunts end up hurting more than their egos?
In both series, a delinquent character softens up and changes upon falling in love with a female character that is in love with a different guy. Both of these male characters desperately want to confess their feelings for the female character but different people and events keep getting in the way
While visiting his hometown, junior high school student Michishio Nagasumi's life was changed forever when he nearly drowned. Though he was saved by a mermaid named San, there’s a catch -- her family is part of a merfolk mafia, and they abide by a strict rule: If a mermaid is discovered by a man, either he or the mermaid must die. That is, unless the man marries into the family! Faced with such a decision, Nagasumi can only oblige their customs and become a "happy" newlywed. Now, with a new school year around the corner, Nagasumi must find a way to deal with his new bride, keep her true nature a secret, and most importantly, escape inevitable death at the hands of San's over-protective father’s gang!
Both anime were comedic romance with a slight fighting theme to them, and both wound up a man trying his hardest to break up the male and female lead, yet ultimately kidnapping and drugging her for a marriage against her will. At this point, All her family and friends must go rescue her with, obviously, the most action packed part of the show. Right down to the rival of the main male with a bit of a ditzy friend, and the rival to the main lead being a flat chested tsundere, these shows were increadibly similar.