Date A Live IV

Date A Live IV takes place 30 years after the spatial quake that killed 150 million people in the Eurasian world. The quakes, though smaller in scale, still pose a threat, and Shido Itsuka must deal with their aftermath. Shido encounters a mysterious girl at the site of a spatial quake and learns she is a Spirit, a being from a different dimension causing the quakes. His mission is to seal the Spirits' powers by forming romantic relationships with them, including his adoptive sister who becomes involved in his efforts.