"Morumo 1/10" is a manga series that blends elements of romance, comedy, and supernatural themes. The narrative centers around a high school student named Morumo Hasegawa, who leads an ordinary life until a fateful encounter with a mysterious cat. This cat, named Chatora, is revealed to be a spirit guardian from the underworld. Chatora grants Morumo the ability to summon ten powerful spirits, each possessing unique abilities and personalities. However, there is a catch: Morumo can only summon one spirit at a time, and each spirit remains active for only ten minutes. This limitation forces Morumo to strategize carefully when utilizing their powers.

The story progresses as Morumo navigates the challenges of high school life while balancing the responsibilities of being a spirit summoner. The spirits, who often have their own agendas and quirks, add layers of complexity to Morumo's daily life. Some spirits are cooperative, while others are mischievous or even antagonistic, creating a dynamic interplay between Morumo and the supernatural entities. The series explores themes of trust, responsibility, and the consequences of wielding power, as Morumo learns to manage relationships with both the spirits and the people around them.

Key characters include Morumo Hasegawa, the protagonist who must adapt to the sudden changes in their life; Chatora, the enigmatic cat who serves as a guide and mentor; and the ten spirits, each with distinct traits and abilities that influence the plot. The interactions between Morumo and the spirits drive much of the narrative, as their actions often lead to humorous, dramatic, or perilous situations. The series balances lighthearted moments with more serious undertones, creating a multifaceted story that appeals to a wide audience. Through its exploration of supernatural elements and human relationships, "Morumo 1/10" offers a compelling and entertaining narrative.