[Guido]

Giving that the OP is a teaser for taste of things to look forward in this show....

Spoiler:

Tiffania might be right after all that she summoned Saito as her familiar, though this is still inconclusive for now.

And, what follows is a natural reaction stirring within her that makes her feel butterflies in her stomach or catching the flu everytime that Saito's around.

So, Tiffa wants to confirm more her feelings than her summon with a kiss from Saito, but comically the secret affair backfires. Consequently, "Melon-chan" literally lands upon Saito's face. (The bastard )

And, Louise & Lemon-chan it was just too cute to be truth, but Malicorne soured the moment. However, if you're in a big residence or hotel with long and spacious halls and wide walls, then the other guests around surely will feel incovenienced if Saito continued with Louise's dere-dere extravagances.

Not much happened substantially for plot's sake that wasn't started, until the conclusion and in-between:

Spoiler:

Josef has Louise kidnapped by the Gunson's siblings, and true to his noxious methods he used formerly on Tabitha, he's going to employ his fatalistic means to draw Louise's Void magic and combine it as one of two ingredients to manufacture his new array of toy weapons.
BTW, conveniently he chose the target ground to test his toys, and thus Aquileia soon will find itself cornered under a siege.