Every night, Eishin dreams of a forgotten garden where a mysterious woman waits beside a crystal-clear pond. She speaks only in echoes, her forgotten name forever beyond his reach, and promises that when the Sacred Lotus blooms, every answer will reveal itself.

Then the impossible begins to appear in reality.

Four-leaf clovers bloom where they shouldn't. An internet phenomenon known as the Echo Board whispers to those who listen. And ordinary days slowly unravel into mysteries older than memory itself.

As the line between dreams and reality fades, Eishin and his friends are drawn toward a truth that has been waiting for them all along.