Satoshi's mind appears to be pretty...barren could be a word for it. A lot of white mist and open space, and lingering feelings of pain and emptiness. Several doors exist in this nothingness. each with a different look and very different feelings coming from it. Satoshi may be encountered at any time here sporting a pair of large white wings. One may also encounter a certain blond angel with inhuman gold eyes, Krad...who is a little too calm and formal, but you're safe if you don't provoke him...
An ordinary door with a white feather carved into it, projects a dark, possessive feeling. Inside is a dark room where a young Satoshi sits in the the arms of Krad. Said angel seems to be whispering to him and both are a little blurred wherever they're touching. Behind them against the wall is a massive black canvas wrapped with chains and barely covered by a torn white draping. A sound as though someone is whispering can be heard, but nothing in detail if a person doesn't linger.
An ornate set of double doors projects a feeling of emptiness. Inside are various works of art: paintings, jewelry, sculptures mirrors, etc. Touching or even looking at any closely triggers childhood memories involving learning his family's secrets.
A red door projects mixed emotions: happiness and protectiveness, as well as some fear and hopelessness. Inside are paintings of a certain red-haired boy. Focusing on them reveals memories of the many interactions with him, as well as ones directly or indirectly about him. The whispers are here as well.
A blank door, reveals Satoshi sitting in front of a blank canvas, with his knees drawn up and with his wings slightly folded. He can be approached and will respond to anyone who happens upon him the same as he would were you both outside his mind. If you've encountered him outside of the room, he won't be here.
If you wander far enough into the nothingness, one final door can be found. No feelings come from it and it's an ordinary sliding door. But inside is a tarnished silver human-sized hourglass, with less than half of the pale blue sand remaining in the top...a physical indicator of Satoshi's remaining time.