Tonagura!

Both contain a highly perverted character (B Gata H Kei = Yamada, Tonagura! = Yuuji) that are actually good at the heart. Both an ecchi/romance series. 

Both shows center around a pair of childhood friends, who might share more feelings, than a simple friendship. Though Tonagura! relies on heavily on humor and fanservice, while Lamune is more closer to slice of life and drama genres. Tonagura is based on a manga, Lamune is based on a visual novel (dating sim). 

Similar plot and animation style, some fanservice and tsundere main female character. 

Both of the anime is tell about pervert boy that do pervert thing or try to do something pervert. Both of them Ecchi and Romance and really funny anime . two of this anime show us a kind love, funny love. if you like Inukami !then you might like Tonagura! this two really funny anime. sry about the mistake in spelling. 

Both are love comedies. The setting is a bit similar, however characters personalities are a bit opposite. In both animes the guy moves in to the girl's house with his little sister. In tonagura, they were neighbors, but technically it was the same since they have to eat and spend most of the time on the girl's house. In both animes the main girl has an inferiority complex with her older sister. In both, the main girl's Older sister teases the guy's little sister, who is afraid of her as result. 

Similar story of a pants - obsessed otherwise nice guy and his female assistant. The timing and humor are nearly if not exactly the same. If you like one you will definitely like the other 

the child hood romance gone away and come back again :) 

both mc are pervert 

Kintaro from Golden Boy might as well be Yuuji's older brother. The pair of them are MC's, are dirty-minded and want to get the girls they like. Golden Boy focuses on different women on each episode whereas Tonagura only focuses on the MC's childhood friend. 

Yuji Kagura and Kyosuke Imadori have one thing in common.. they are perverts who always like to such things despite being beaten up..  

Old childhood friends re-unite in high school and both are comedy romance animes. Main characters in both have hobbies they both enjoy. 

For the real "otaku's", I'll say: Both have ecchi. For people who actually care about the shows and not just animated boobs. Although Umisho deals with Ecchi overall, in Tonagura! they only deal with ecchi of one person point-of-view. The art does match quite a bit, but the story's are different on multiply levels. But then again, the art's pretty much the same, just like some characters are similar. The comedy are both of the same factor, and some situations are exactly the same. 

The story since it begins with old childhood friends meeting again during highschool. After many years, they all want to recall the good memories of their childhood spent together and clearing up those feelings, they've left behind. Both shows are themed around the topic of childhood love and friendship. In Tonagura the male protagonist and his sister move in to their old home from 10 years ago, which happens to be right next to the female protagonist's home. Tonagura relies heavily on humor and fanservice and is based on a manga. In contrast to Tonagura, the characters of Yotsunoha meet up in their old school, now abandoned and to be condemned. Yotsunoha is a short, 3 episode ova series, based on an eroge. read more 

The titles look the same. Both have main male characters that have the delinquent look and have tsunderes as their counterparts.  

The style of the anime is the same and both the storylines are about love. With Itazura na Kiss you get more part were you get the chills, because it is sooo sweeet!!!