Today starts with the big volleyball rally. Enjoy a lovely anime cutscene where a kid gets pegged in the face with a volleyball and then take control of your character. You and Ryuji are planning on skipping the rest of the day’s matches in order to interrogate some of the volleyball students. Too bad you have to find them first.
The first player is in building 1 (the same building that you had class in a few days ago). Run there from the courtyard (it will be the left side of the map), go through the doors, and head to the second floor. You are looking for classroom 2-D, which is to the left of all major stairways. Go inside and you will find your first beaten-up volleyball man at the chalkboard. Talk to him.
Poor kid. Anyway, now back to the first floor. You are looking for classroom 3-C. Not all classrooms are labeled on the map, but they do all have small signs above their doors. When you find it, you will see a kid with bandages on his face standing by the door. Talk to him.
No dice yet again. Now up to the third floor and classroom 1-B. Same deal here: Look for the sign and talk to the kid with the bandages. He will spill the beans on a boy named Mishima who has been receiving "special coaching." Remember that name, and return to the courtyard to meet up with Ryuji. While you are waiting for him, you will meet Ann, who will become more important tomorrow. Now time for some shut eye! Head back home, and go to sleep.