In Doukyonin wa Hiza, Tokidoki, Atama no Ue, Subaru Mikazuki, a reclusive 23-year-old mystery writer, prefers the company of books over people due to his shy and introverted nature. Haunted by the tragic loss of his parents, Subaru's solitary existence is interrupted when he encounters a stray cat named Haru at his parents' grave. Taking Haru into his home, Subaru faces the challenge of caring for another being for the first time in his life. Despite his struggles with self-care, he showers Haru with affection and food, a gesture appreciated by the grateful feline. As Subaru navigates this new responsibility, Haru observes his shortcomings in looking after himself. Through this unlikely companionship, Doukyonin wa Hiza, Tokidoki, Atama no Ue explores the heartwarming tale of a human and a cat forging a bond based on mutual understanding and support.