Seitokai no Ichizon Lv.2

Similarities: Both involves weird and noisy guy in the company of 4 girls. Both male characters don't get any respect from their harems. Both have the same school, harem, romance and comedy genre. Both have the same setting where it involves a room in some school and there weird guy and 4 girls where anything can happen. Dissimilarities: One the group of characters in one anime involves members of the school's student council, while the group of characters in the other anime are club members. The male character in one anime was someone who wants a harem, while the male character in the other anime is a chunnibyou. One anime has an extra supernatural genre. read more 

In my opinion: It has the same kind of characters , where there is a guy, a club president, a vice president, a secretary and a member who is the youngest. Also, both guys in both anime were obnoxious, and the club presidents are seniors, except that the president in "Inou-Battle wa Nichijou-kei no Naka de" is a refine girl and is the tough one, also the vice president in the said anime is more of an analytical one, the youngest girl in the said anime is far more younger than the girl in "SnI". Also, the anime " Inou-Battle wa Nichijou-kei no Naka de" has an extra magic genre. Persuasive Argument: Go watch and compare.  read more 

The same plot where it involve one obnoxious guy who gets no love from 4 girls in his club, and the girls where they typical bunch where one is the president who is also the sempai, there is the vice president, there is a secretary and another member who is the youngest . But, the new anime seemly have a 5th girl member, while the old anime only has 4 girls in the guy's harem. 

What do they have in common? 1. They both have the same harem genre where it was set in a club room. 2. They have the same number of girls to boy ratio. 3. Both male characters were either weird or obnoxious. Differences: In Seitokai no Ichizon Lv 2, the guys isn't the only obnoxious characters but also the girls as well. In Inou-Battle wa Nichijou, only the guy is obnoxious.  

Slice-of-life anime with nearly identical set-ups - that is, both shows center around the student council around their respective high schools. Both do not really have any clear plot to them, but they easily make it up for it with humor. Be warned, however: Seitokai Yakuindomo has humor that is much more vulgar and explicit.