"Mina no Mori no Kanna-sensei" centers on Kanna, a young woman who moves to a remote village to work as a teacher at a small school. The village is surrounded by dense forests and is home to a close-knit community with deep ties to nature and traditional ways of life. Kanna, initially unfamiliar with rural living, must adapt to her new environment while navigating the challenges of teaching a diverse group of students, each with their own unique personalities and struggles.

The narrative explores Kanna's growth as she learns to connect with her students and the villagers. Her teaching methods often involve creative approaches to education, blending academic lessons with practical life skills and an appreciation for the natural world. The students, ranging from mischievous to reserved, gradually open up to Kanna, revealing their individual dreams, fears, and familial backgrounds. Through her interactions with them, Kanna gains a deeper understanding of the village's culture and the importance of community.

The forest plays a significant role in the story, serving as both a literal and metaphorical backdrop. It is a place of mystery, beauty, and danger, with local legends and folklore woven into the villagers' daily lives. Kanna's experiences in the forest, whether through school outings or personal exploration, often lead to moments of introspection and bonding with her students. The series also touches on themes of environmental stewardship, as the villagers strive to maintain a balance between progress and preserving their natural heritage.

Supporting characters include the village elders, who share wisdom and stories with Kanna, and fellow teachers who provide guidance and camaraderie. The relationships between the villagers and Kanna are central to the narrative, highlighting the importance of mutual respect and understanding. As Kanna becomes more integrated into the community, she begins to see the village not just as a place of work, but as a home.

The series balances lighthearted moments with poignant reflections on life, education, and the human connection to nature. It portrays the challenges and rewards of teaching in a rural setting, emphasizing the impact of a dedicated educator on both students and the broader community. Through its focus on character development and the interplay between tradition and modernity, "Mina no Mori no Kanna-sensei" offers a heartfelt depiction of rural life and the transformative power of education.