After fainting at work, a young lady awakens in the back room of the café she works at with no memory of her life or those around her. Two of her friends, whom she soon learns are named Shin and Toma, are called to help her get home safely. Once she is alone, she meets a spectral boy named Orion that only she can see and hear. He explains that she lost her memories because of his chance visit to her world, so he vows to help her remember who she is. However, regaining her departed memories without worrying those around her may be more difficult than she realizes. In addition to the gloomy Shin and the protective Toma, she must be wary of arousing the suspicions of the captivating Ikki, the quick-witted Kent, and a mysterious man who lurks in the distance. As her amnesia entangles her in the lives of each of these men, her fragmented memories return piece by piece, and the mysteries of her circumstances slowly come to light. [Written by MAL Rewrite]

A psychic ninja fantasy suggesting that the assassins did not die out during the Sengoku era but burrowed under Japan, where they fought a new war against the alien occupants of a crashed spaceship that has lain undisturbed for several millennia.

Nora Handa is a boy who lives with Shachi Yuuri, who was adopted by his mother. With everyone supporting, the two of them grew up healthily even after their parents passed away. Shachi, who likes Nora the most, wakes him up every morning. Nora spends his happy student life with Michi Kuroki, who is a disciplinary committee, honor student at school and childhood friend of the main character, Yuuki Asuhara, who is a gal but is very bright and can talk his worries to, and more friends at school. One day, Nora meets a girl who calls herself Patricia at the park on the way to the school. Patricia is a queen at hell, and claims to come here to destroy the life on land. However, she is damaged heavily because she touched the life for the first time. The energy was stronger than her, so Nora needed to tend her. Patricia asked him to tell her about the mysteries of life, and he had to even explain the ero book that he found at the park...?!

An episode of Ketsuekigata-kun that acts as an advertisment for Ketsuekigata-kun and Teekyuu DVDs aired in Ketsuekigata-kun's regular time slot a week after episode 12.