"Hirofumi, I need you to move out next week."

That's what my dad suddenly told me, Higashikujo Hirofumi, a second-year high school student, on a Saturday morning. As I stood there bewildered, Dad explained.

He said the girl was exquisitely beautiful.

He said the girl excelled academically.

He said the girl had exceptional athletic ability.

He said the girl was an Ojou-sama.

However, despite all these overflowing characteristics—settings so clichéd even light novel heroines don't use them anymore—this girl had a flaw so great that it outweighed all her virtues.

"...Kiryu Ayane... She's a 'Villainess,' isn't she?!"

Sharp-tongued and ill-natured. A thrilling cohabitation life begins with this fiancée, whose nickname, naturally, is 'The Villainess.' It starts now!

...Or so I thought. For some reason, my two childhood friends look displeased, my junior is furious, and a relative's daughter is barging in...

Please, just let me live a peaceful life!

*Main story completed. The spin-off, "Extra!", is currently being serialized. "Extra!" is just pure fluff. It's considered a bonus stage for the protagonist who worked so hard.