Tokyo Underground

From Mobots:
Rumina Asagi is high school student, who dreams of a ‘rose-colored life’ with a cute girl. Along with his science otaku friend, Ginnosuke Isuzu, he lives a pretty normal life. Until the day that he discovers a huge hole in his backyard, along with two women, one a hot tempered blonde (Chelsea Rorec) and the other… the girl of his dreams (Ruri Sarasa). But… where did that hole come from?