What I Only Wrote in My Diary

"Nikki ni Dake Kaita Koto (What I Only Wrote in My Diary)" is the fourth song in the "Advent Story" series, told from the girl's perspective.
Since the day he confessed, her chest feels warm and strangely calm, even though she is still scared. She writes down the truth that she can't say out loud yet-how his voice won't fade from her mind, and how their time apart only deepens her feelings-only in the pages of her diary.
She still can't say "I love you" to his face, but quietly hopes to tell him "Thank you for waiting" someday. Wrapped in gentle winter tones and a soft, piano-led arrangement, this mid-slow love ballad captures the fragile, honest moments of a heart that is still catching up.