Pretty solid animation. I definitely enjoyed it and am looking forward to the next episode. That said, I'll throw a little constructive criticism out there as well, pretty much entirely on the sound design and voice acting end.
Keiichi's voice tends to sound kind of forced throughout most dialogue. Doesn't feel like a natural conversation whenever he's talking. The best way I can put it is that the voice acting itself is good out of context, but the feeling of it doesn't always compliment the conversation its in. Dea's voice being robotic makes sense, though, given her personality (or lack thereof).
The other thing is the sounds are very dry. It sounds like people talking into a studio microphone instead of people talking in a room. In a room, there would be some ambient noise, reverb on the voices, maybe even some light EQ depending on the environment. It could be worth working in some of those sound design factors to make everything come across as more natural. It's okay right now, but very sterile, which is not how real life sounds.
Even if these tips aren't immediately helpful for this project, they'll be good to keep in mind in general. In any case, nice job overall. I'm looking forward to seeing some more of this!