Haruki Sato has always found solace in solitude. Quiet, unassuming, and invisible to most, he drifts through his final year of high school in the background, where he prefers to stay. But his world shifts the day Aki Fujiwara enters his classroom-a girl who, like him, seems to disappear in a crowd. Pale and reserved, with eyes full of unspoken secrets, Aki is the first person to make Haruki feel truly seen.When they cross paths in the school library, a tentative connection begins to form, their shared silences saying more than words ever could. As they work together on a school project, a bond blossoms, leading them into unfamiliar territory: friendship, trust, and the slow, delicate promise of something more.But both Haruki and Aki carry invisible burdens, and letting someone in isn't easy when you've built walls around your heart. Will they find the courage to break down those barriers and discover the beauty of being truly known?A Heart's Silent Echo is a tender, slow-burn romance about two introverts learning to open up, trust, and, perhaps, fall in love.