生きてゆくのに心は (Ikite Yuku no ni Kokoro Wa)

Background
"I am Δ (delta). I don't know."

- Author's comment "Even though I'm alive, my heart is-" is an original song by Δ (read "delta") featuring flower. It was uploaded to YouTube and Niconico on August 9, 2019.

Official

 * Piapro - Instrumental