Ntr Tenshi Itoshi No Yuusha-sama Ni Naisho De S... -

Absolutely not. Even if you avoid all NTR events, the very premise is designed to make you paranoid. The “pure ending” feels hollow because you know what could have happened.

This is almost certainly a reference to a specific adult or dark fantasy visual novel / RPG game title, likely from a circle on DLsite or a similar platform. The full title is probably something like: NTR Tenshi Itoshi no Yuusha-sama ni Naisho de S...

You play as , a chosen warrior destined to defeat the Demon Lord. At his side is Tenshi-chan (the Angel) , a celestial being sent by the goddess to guide and support him. She is pure, kind, and devoted—at least at the start. Absolutely not