There has been a few recently. The dangers in my heart is currently my favorite, uzaki-chan, The Story Between a Dumb Prefect and a High School Girl with an Inappropriate Skirt Length, blooming love, and The Babe at My Back Has Her Eye on Me. I’m Done For is some of the ones I've been...
She did say she had a onee-chan (during the flashback when she looked at her sis' laptop), so assuming sis is a licensed professional and either works or runs a beauty/tattoo kind of place for a living then her older sister could have done it for her.
With the MC's kind of crippling social...