What kind of title is this?: Manga.
How many volumes are there?: 4 volumes are listed.
How many chapters are there?: 21 chapters are listed.
Where can I read it?: Reading links are listed for Pixiv Comic, Yen Press. Check availability in your region.

Synopsis

About I'm the Villainess, So I'm Taming the Final Boss

Avoid the bad ending at all costs! When her fiancé breaks up with her in front of the entire student body, noblewoman Aileen d’Autriche is devastated—or she would have been, if that wasn’t also the exact moment memories of her past life came crashing back! Turns out, she’s been reborn as the villainess of a dating sim... and according to the story, she’s slated to die at the hands of the demon king in three months! But Aileen’s already got a plan: Step one, get Demon King Claude to fall in love with her. Step two, live! (Source: Yen Press) Note: Includes four extra chapters.

Comedy Fantasy Romance