I Reincarnated as the Villainess' Childhood Friend Who Falls into Darkness. If I Die, It's a Guaranteed Bad End, so I Became the Strongest... but Hasn't She Already Fallen into Darkness (and Turned Yandere)?

I Reincarnated as the Villainess' Childhood Friend Who Falls into Darkness. If I Die, It's a Guaranteed Bad End, so I Became the Strongest... but Hasn't She Already Fallen into Darkness (and Turned Yandere)? — Hana