Maho Tama Series - Sukumizu Hen by Erogos - Adult Sex Game

How odd. When I woke up, there were girls I had never seen before in my bathroom. If I were to yell loudly now, although my friend that's living nearby would be hastily coming to check on me, there's no way that those half-naked girls in my bathtub wouldn't arouse a misunderstanding. However, I remember nothing... well, actually I do.
I recall that, a few days ago, my father had whispered something over the phone. Some ramblings about Magic Users. Eh, Magic Users? Yeah right they exist.
Naturally, these girls were Magical Girls. And on top of that, they just presented me with a letter from my father, big deal!
Although I should have egotistically denied the very existence of these magic users, I was stunned with immeasurable disbelief when I attended school and the entire campus was steaming with girls wearing school swimsuits.
Every conceivable female student of the school was wearing swimsuits! With no care in the world they went in and out of school grounds, socialized and went about their days in school, waited at the railway station for their commute, acted as if the shopping mall was theirs...
To be perfectly honest, it was a dreamscape by all means possible. But with the difference that it wasn't a dream at all. It was reality! Magic Users are the bomb!
And thus, as if pulled effortlessly on a string, our protagonist jumps readily into the many troubles that his Magical Girl, Mei, stirs up.