My Days with the Demoness

Story

After losing his best friend, a fellow college student, Asaki Tomohiro, turned to the NEET life, and began obsessing with the idea of creating a portal to another world. One day, he managed to finish the prototype and upon testing it for the first time, caused quite the accident; the device brought a girl into this world, who introduced herself as the daughter of a demon lord in her own world, Nero Ei Vixonni.