"Seishun Anime Zenshu" is a compilation series that adapts several classic Japanese literary works into anime format, each focusing on themes of youth, growth, and personal struggles. The series is episodic, with each segment presenting a self-contained story based on a different novel or short story. The narratives explore the emotional and psychological challenges faced by young protagonists as they navigate relationships, societal expectations, and their own identities.

One notable story in the series is "The Spider's Thread," based on Ryunosuke Akutagawa's work. It follows a young man who grapples with feelings of guilt and redemption after committing a crime. The story delves into his internal conflict and the moral dilemmas he faces, culminating in a poignant exploration of human nature and the possibility of salvation.

Another segment, "Run, Melos!," also by Akutagawa, centers on a young man named Melos who makes a promise to his friend to return after completing a task. The narrative focuses on themes of loyalty, trust, and the strength of human bonds as Melos races against time to fulfill his promise, facing numerous obstacles along the way.

"Night on the Galactic Railroad," based on Kenji Miyazawa's story, follows two boys who embark on a surreal journey aboard a magical train. The story intertwines themes of friendship, loss, and the search for meaning, as the boys encounter various symbolic characters and landscapes that reflect their inner struggles and aspirations.

Other segments include adaptations of works like "The Nose" by Akutagawa, which examines vanity and self-perception through the story of a monk with an unusually large nose, and "The Girl Who Leapt Through Time" by Yasutaka Tsutsui, which explores the consequences of time travel and the inevitability of change.

The characters in "Seishun Anime Zenshu" are diverse, each representing different facets of youth and human experience. Their journeys are marked by introspection, growth, and often bittersweet realizations about life. The series captures the essence of adolescence and the universal challenges of coming of age, making it a reflective and thought-provoking collection.