Adachi and Shimamura, two young women who attend the same high school, are inseparable friends. Whether playing table tennis, chatting about favorite TV shows, or just relaxing together, they’re happy to share their days. When Adachi’s friendship turns into romantic attraction, the relationship begins to change, one day at a time. (Source: Seven Seas Entertainment)

The story centers around the treasure of Nanana, a ghost who was once a beautiful but NEET (Not in Education, Employment or Training) girl. A boy named Juugo was disowned by his father and forced to transfer to a high school on the "Special Student Zone," an artificial island. With only 40,000 yen a month to live on, Juugo chooses a low-rent apartment that happens to be haunted by Nanana. Juugo and members of the school's adventure club join a "treasure hunt royale" on the island for the Nanana Collection, a treasure that possesses a mysterious power.