Natsuki Tatsuo is a 17-year-old high school student. For a whole year, his life has just been the same; wake up, have breakfast, go to school, go to work, go home, go to sleep, and rinse and repeat. However, one day when he visits the enigmatic Giichi Castle and meets the silver-haired Hanako Giichi, he subsequently finds himself using a "Proprius," a supernatural ability that no average person is born with - causing his entire life to be flipped upside down.-(I commissioned the cover artwork from Shibazakura on Fiverr.)