weeeell unless he finds something to remember her by he's not going to remember Ariel just yet. He kind of needs physical objects to remember people.

BUT.

Senri thinks she's a nice person, and he doesn't really mind that she's mute or anything. Even if their communication is a little hit and miss because neither can really communicate their wants and needs outside of body language and gestures. Maybe sometime they can go on mute adventures and he can stick a flower in his book so he doesn't forget the nice lady who can't talk but is still cool to hang out with. (Though for the record next time they meet he's going to forget she's mute as part of the amnesia package.... whoops)