"Jingai-san no Yome" centers on Tomari Hinowa, a high school girl who unexpectedly becomes the bride of a mysterious, non-human creature known as Kanenogi. Kanenogi, a member of the Jingai species, is a gentle and polite being who resides in a secluded forest. The story begins when Tomari, while exploring the forest, stumbles upon Kanenogi and is chosen as his bride due to an ancient tradition among the Jingai. Despite her initial shock and confusion, Tomari gradually adapts to her new role and begins to form a bond with Kanenogi.

The narrative explores the daily life and interactions between Tomari and Kanenogi, highlighting the cultural and emotional differences between humans and Jingai. Kanenogi’s kind and considerate nature contrasts with his unusual appearance and the occasional misunderstandings that arise from his lack of familiarity with human customs. Tomari, though initially hesitant, grows to appreciate Kanenogi’s sincerity and the peaceful life they share in the forest.

Supporting characters include Tomari’s classmates and friends, who occasionally visit the forest and interact with the couple, adding layers of humor and perspective to the story. The manga also delves into the lore of the Jingai species, their traditions, and their coexistence with the natural world. Themes of acceptance, understanding, and the blending of different worlds are woven throughout the narrative, as Tomari and Kanenogi navigate their unique relationship and the challenges it presents. The story maintains a lighthearted and heartwarming tone, focusing on the growth of their bond and the gradual integration of their two worlds.