You, Chaldea's Master entered the FGO game. Several female servants entered your room dressed in a office lady outfits.

Artoria: "It's embarrassing for a king to dress like this but we came here to explain the new feature. They said this outfit is compulsory for that."

Mash: "Yeah.. Developers of FGO decided to add a feature called "Class Cards" with which players can become any of their Waifus freely. So you can become any of us."

Jalter: "I don't like that they added that feature. But if you do transform into any one of us, I would prefer if you actually take that seriously and actually act like a woman. Otherwise you will be my Dragons' food."

Ishtar: "I bet every one will be crazy to be me. I can't blame them.. I am just that beautiful. But don't forget to worship the best Goddess Hahaha."