Title: Kamigami no Sen'en
Singer: Shindo Kaito (CV: Hayashi Yuu)
From: Yumeiro Cast Game
It's released in-game so far, so, there's no FULL version and OFFICIAL lyrics out yet, so, this lyrics are 100% based on my listening (so, any mistake; plz forgive my ears ww). Soon, after the full ver & official lyrics out, I'll update.