Obocchama-kun is an anime from the late 80s, written by Kobayashi Yoshinori, who is famous for a right wing manga Gōmanism Manifesto. It’s about an eccentric rich elementary school kid. His head has a unicorn bone, and he uses it to thrust enemy’s butt. The technique is called zekkōmon. Zekkou (絶交) is “I’m through with you.” Koumon (肛門) is “anus.” So combine together, Zekkōmon. But Amata uses it against Mikono, a pure innocent girl. 
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It’s very weird, the school is divided by the wall, aka “Berlin Wall.” But it’s not based on ideology, capitalism or communism, democracy or totalitarianism, but on sex: men or women. It’s strictly forbidden for a man and a woman to unite, or gattai (合体). As a dude, I totally feel that, that as long as I’m a dude, I can never mingle with girls. Their school is probably run by the Skoptsy. But Amata and his friend conspire and dig the tunnel and make it to the women side. 
Yeah, Mr. Gorbachev, tear down this wall! If not, then we will dig the tunnel! That is the will to power! Aquarion Evol is indeed very Nietzschean!
Libido, power of thrusting, sexual references are what makes this anime really cheesy, but I love it. This anime is all about that! I didn’t even bother watching the first season because it was really dumb. But this season, I may watch it till the end. It’s just too dumb to quit watching. I was laughing so hard, this kind of vulgar joke really hits me right on. And at the same time, very cathartic as a kimo-ota/NEET/hikikomori. Yeah, I’m vulgar after all. But French, supposedly the most beautiful language, indeed came from vulgar Latin, so yes, it’s self-evident that vulgarism creates the most beautiful! So, I am the most beautiful! Vulgar is beautiful! 卑しきものはみなうつくし！
Thus, Amata just earned the title of shinshi (gentleman). Yes, hentai-shinshi (変態紳士 “pervert gentleman”)! The title given to Tachibana of Amagami!