Suicide Prevention Bunnies (feat. Yuzuki Yukari) by Komiya-chanP

Japanese title: 自殺予防ウサギ
Link: https://youtu.be/B2r2x78xmv0
It's not a very well-known song, but it's very beautiful in my opinion. Despite the heavy topic, it retains some measure of hope. Even if you don't want to cover it, maybe try giving it a listen if you don't know it already.