Nobunaga-sensei no Osanazuma

Extreme ecchi stuffs between students and professors, both are 12 minutes long and are from the same season. 

Basically the same anime Both are borderline-hentai ecchi harem animes In both anime, the protagonist is surrounded by females who all want to 'sleep' with him (and not actually sleeping, the bad sleeping) 

Basic similarities between both animes: They have a harem where the main girl accepts her mistress. Show or talk about historical characters, Campione: Gods and related; Nobunaga: Oda Nobunaga and characters from the Sengoku period. About the plot, The story is mid and easy to watch for fun, but they´re not the greatest. Both don't have a second season and they leave the anime with a kind of continuity 

If you liked Nande Koko ni Sensei ga!?, or even To Love Ru, you will probably love Nobunaga-sensei no Osanazuma. It's a ecchi comedy that focus on a mid school professor and, trust me, you've never seen an ecchi more NONSENSE than this, I can assure it for you my boy. 

The same loli relationship that involves older guy to very young girl, except in Ryyyou the guy was just slightly older than the girl or like a 7 years difference, while in Nobunaga there is a 15 year difference.  

the same teacher and young person kind of relationship , except in Onegai Teacher was more like a Cougar and Tadpole relationship, in Nobunaga, it is more like a loli relationship between male teacher and a 14 year old girl. 

both anime are about a love relationship between young male teacher and loli female student who likes to tease him