The Villainess is Being Supported by the Mob Guy is a Manga/Manhwa/Manhua in (English/Raw) language, Shoujo series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Amidst the Villainess' condemnation, a mob guy that transmigrated from another world appeared before her??? The No. 1 hated Lady of the Academy, Rira, for some reason, is getting continuously supported by a guy called Sasaki- a person whose existence somehow she hasn't noticed 'til now...!