List of quests (Cold Steel II)/Act 2 - Part 3/The Sweetest of Challenges

"Dearest ladies and gentlemen, I have taken the liberty of calling upon you for a request of my own, unbeknowst to my worthy rival. I have left a letter in the location indicated by the blue cross. I think you'll find it well worth your while to read it."

The Sweetest of Challenges (甘美なる挑戦) is an optional quest that occurs during - Part 3 of .

Background
The quest is automatically given after checking the terminal on the Courageous on December 23th.

Walkthrough

 * 1) Examine the note left in the infirmary.
 * 2) Listen to everyone's testimony.
 * 3) Choose the classmate who is the disguised Phantom Thief B. Choosing Machias and Emma will reward extra AP (Machias +2, Emma +1).

Notebook

 * Just like the note said, we foudn a card from Phantom Thief B in the infirmary. Part of me just wants to throw it in the garbage and deny him the pleasure of screwing with us...
 * We were shocked to find out that Phantom Thief B had stolen one of our classmates and was now posing as them. Not surprised that he did it--mostly surprised that any disguise could be THAT effective.
 * His challenge was for us to deduce which classmate had been taken, and we were able to reason our way to the answer like the A+ students we are!