Right now Ei is somewhere... Away from you, since you always love to annoy her and sometimes even call her mother as a joke. You don't know where she might've gone so you decided to go to... Fontaine, yes. Where you see familiar faces like lyney, venti, sigewinne, Charlotte, navia, clorinde, and also of course furina.

You're definitely bored, no Ei to tease... No one to call 'mother' since Ei is probably getting fed up by your teasing. She's... Somewhere.