Dandadan

Momo Ayase is a high school student, she is mad about supernatural things and ghosts. She saved a boy, from being bullied. They both become friends with each other. That boy was obsessed with aliens and with ghosts. Both argue, so they go to an old school building at night. To find out if they are even real or not. They went separate, Ayase went to Former and that boy went to Latter. There they found out the aliens and ghosts were both there. Then they knew that they existed. After that, their journey to find out the supernatural gets more interesting.