Agon Shū literature primarily consists of works by founder Seiyu Kiriyama exploring the Agon Sutras, Buddhist rituals, and spiritual practices, available through the Agon Shū official publisher and temple resources.
Key Books by Seiyu Kiriyama

You Have Been Here Before: Reincarnation – Explores the concept of reincarnation, the soul’s journey, and experiences beyond death.
21st Century: The Age of Sophia – The Wisdom of Greek Philosophy and the Wisdom of the Buddha – Compares Greek philosophy with Buddha’s teachings and discusses cultivation of wisdom.
The Wisdom of the Goma Fire Ceremony – A detailed account of fire-offering rituals (goma) and their spiritual significance in achieving Buddhist wisdom and purification.
The Marvel of Spiritual Transformation – Outlines principles of self-transformation and the path to miracles through inner change.
Kōfuku no genri (The Principles of Happiness) – Kiriyama’s early work on the principles of spiritual and practical well-being.
Henshin no genri (The Principles of Transformation of the Body) – Focuses on the abilities obtained through esoteric Buddhist practices, including supernatural capacities and divination.
1999 nen karuma to reishō kara no dasshutsu (Escape from Harmful Spirits and the Karma of 1999) – Discusses karmic influences, spiritual purification, and ritual practices.

Agon Shū emphasizes the Agon Sutras (Agamas) as the foundational Buddhist teachings. These texts include the Seven Systems and Thirty-Seven Practices, which outline methods for attaining enlightenment, including:
The Four Foundations of Mindfulness – Focused contemplation on body, feelings, mind, and phenomena.
The Four Right Efforts – Practices to prevent or remove evil and cultivate goodness.
The Four Bases of Spiritual Power – Methods to develop concentration and divine abilities (siddhi).
The Five Faculties and Five Powers – Growth of faith, effort, mindfulness, concentration, and wisdom.
The Seven Factors of Enlightenment – Investigation, effort, joy, tranquility, detachment, concentration, and mindfulness.
The Noble Eightfold Path – Right view, thought, speech, action, livelihood, effort, mindfulness, and concentration.
These are not individual book titles in standard publication form but are systematically arranged as doctrinal teachings within Agon Shū literature.
Where to Access Agon Shū Books

Official Publisher: Hirakawa Shuppan Inc. (direct purchase online or by facsimile/email).
Bookstores: Available in Japanese and sometimes in international bookstores like Amazon.
Agon Shū Headquarters and Temples: Can provide recommendations and purchase options.
Academic and Historical Studies
Dynamism and the Ageing of a Japanese 'New' Religion by Erica Baffelli and Ian Reader – scholarly study of Agon Shū, its founder, and development as a modern Japanese Buddhist movement

Other academic works include dissertations and historical analyses detailing Agon Shū’s practices, organizational history, and connections to the Agama Pitaka