Kigurumi Sentai Kiltian / Battle Team Kiltian

Hentai is based on the manga of the same name by Endo Takuji and Nekojima Rei. It was produced at the Dangun Pictures studio in 1996. 

The action takes place in our time. Alien creatures with high-tech weapons invaded Earth. Their commander uses his most dangerous weapon - a long speech, during which even the most steadfast fighters of his squad overheat in the sun. The first target of the alien attack is a local Japanese academy. It seems that an educational institution can oppose powerful armed aliens? However, they have two mecha of super kawaii design, controlled by two academy students naked...