How Long Does It Take to Watch DAN DA DAN?

This is a story about Momo, a high school girl who comes from a family of spirit mediums, and her classmate Okarun, an occult fanatic. After Momo rescues Okarun from being bullied, they begin talking. However, an argument ensues between them since Momo believes in ghosts but denies aliens exist, and Okarun believes in aliens but denies ghosts exist.

To prove to each other what they believe in is real, Momo goes to an abandoned hospital where a UFO has been spotted and Okarun goes to a tunnel rumored to be haunted. To their surprise, they each encounter overwhelming paranormal activities that transcend comprehension. Amid these predicaments, Momo awakens her hidden power and Okarun gains the power of a curse to overcome these new dangers! Their fateful love begins as well!?