Stop teasing me right now!Da Vinci-chan and I don't know the cause of it,It's spreading like wildfire and outside is chaos...!Whoaa... What a turn of events...There will be those who will make use of this chance to have fun with this situation!Senpai, I think you better run befor-....Who are you anyway?This is bad, Senpai! There is a virus spreading in Chaldea that makes the Servants gender-switched!Ehh~~ How this can be~!?Um...I- It's me!MAS~ TEEERRR~We're in serious trouble here!so we don't have any countermeasures for this...It's me, Mash! Demi-Servants seem to be affected as well, so now my body is now of a man...Say, you turned into quite a handsome guy, like a Johnnys boy or something.
A "Johnnys Boy" is slang for any boy that has bishonen looks thanks to the original boy band introducing the concept to a wider audience. Not to be confused with Ikemen.