This one is a goofball riot. I like the title 吉永サユリがやって来る ヤァ!ヤァ!ヤァ!a bit more, since you can go YA! YA! YA!!! It has plenty of work on it done by Sapporo Momoko, an industry legend. She used to be an jpop girly but got disillusioned with the industry and switched to eroge. I highly suggest the game Cinemahouse Yokouso e, which is easily texthooked if you need that.
The story in this one (or an excuse of one) is that you are a teacher who looks like Jesus Christ (godbless) and you run a school where learning math, literature, and science is NOT ALLOWED. No. You must only do naughty things. So you must go make sure the students are learning properly, because you're such a swell guy. The art is pretty nice.
The tone is very goofy. I imagine it must be very liberating to be crushed by your work just to scoot off and write this nonsense simply because you can.