Alright so the anime ends with the war between the 2 factions for control of the earth and everything is fine. Then the special OVA is up, both worlds merged and MC has the most perfect 4 waifu harem. The leaders of both factions become his family basically cause his harem. Then the mecha turns into a space ship and they decide to explore space. Anime ends and no second season is ever made....... The anime was some good 90's mecha isekai, the harem was built, everything is set. But it just ends there................Maybe a miracle will occur and it will get a remake or some sort of sequel one day.