This article examines the emergence, evolution, and literary significance of the I-novel as a distinct genre in Japanese literature. The Inovel genre, which originated in the early 20th century, is a deeply personal and confessional literary form that emphasizes autobiographical elements, psychological introspection, and self-exploration. Initially criticized for its excessive realism and lack of artistic distance, the genre gradually gained literary recognition, becoming a central part of Japanʼs modern literary tradition. Early I-novels focused on the truthful depiction of the authorʼs life experiences, but over time, they developed into works that delve into themes of identity, existential dilemmas, and social alienation. This study employs a comparative literary and historical approach to analyze the genreʼs transformation across different periods. By the mid-20th century, the Inovel had solidified its influence, inspiring contemporary authors and shaping narrative techniques in Japanese literature. Ultimately, the I-novel remains a powerful medium for exploring the complexities of personal identity, individual struggles, and societal expectations, making it a significant contribution to world literature.