Amaenaide yo!!

They both have a very similar feel. Both main characters seem out of place, Both are in training, Both of them are misunderstood. 

The main characters in the anime are very erect. They will get turned on if they see a little peak of the woman's parts and then eventually getting beat by the female support characters. These anime are both ecchi and harem that have fighting involving whether it is supernatural or martial arts.  

Both male protagonist turn on the badass switch whenever their turned on. And they're both in a place filled with girls.  

* Both male MCs are kinda perverts.....which unleashes incredible amount of power (magic or whatever you want to call it) when they see something erotic... * The main character is proving himself to these girls that he is not who they originally see him as...(but still fails at it) * Both has all kind of deres ( especially ABUSIVE type ) * Both has romance feel... [Hidan no Aria feels way more than Amae! ]  

In both series, a guy moves into a girls-only dormitory and is beaten by a long-haired girl who claims she does not like him, despite the fact that she does, while being teased by her friend for that. The protagonists share the desire to be better in order to reach their goals. The cast is also similar, consisting of a tsundere; a lazy tease; a hyperactive girl; a shy maiden; and a quiet, calm virgin. The episodes of Amaenaideyo!! and Love Hina are filled with funny, happy, romantic and dramatic moments. 

Both main characters are boys that are surrounded by a ton of attractive women. In the series, the main character already has an interest in one of the many girls but due to many problems and hindrances they are negated to reveal they're true feelings. 

These 2 has the exact same story, guy going to a Temple full of girls to become a monk. There he becomes overwhelmed surrounded by the beauties of the world. But can he suppress his worldly temptations.