Amnesia
"I don't remember." Tatsumi huffed angrily.
"How can you not remember?!" Tsuzuki exclaimed. "You were the one who assigned us to this case! Now what did you find out about Muraki?"
"What's a Muraki? Is that the new car that's out?"
"CAR????"
Tatsumi pushed up his glasses. "If you're just going to repeat the things I say, Tsuzuki, then I guess I'll get back to work."
"Tatsumi, aren't you supposed to be smart?" Tsuzuki sighed.
"I wasn't born smart, nor was I…..I don't remember."
Tsuzuki was about to say more when an idea came into his head. If Tatsumi was losing pieces of his memory, then maybe he could try to squeeze some money out of him to go buy more sweets.
"Say, Tatsumi, do you remember that money you owe me?" Tsuzuki asked sweetly.
"No."
"Well, you've owed me that for a few weeks now."
"Tsuzuki. I don't remember owing you money because I would never borrow money from you of all people!!! Now get back to work!!"
"Yes, sir!!" Tsuzuki ran off.
This is bad, he thought to himself. What will happen if Tatsumi never gets his memory back?