The Fallen Yandere Hero Was Entrusted to a Slime: I Died Protecting My Childhood Friend, the Heroine, Reincarnated as a Slime, and When We Reunited, All My Former Companions Had Gone Yandere

闇堕ちヤンデレ勇者はスライムに託されました～幼馴染の女勇者を守って死んだ俺はスライムに転生し、再会した仲間は全員病んでしまっていた件～