Kei is a polite person, so he tries really hard not to laugh at Serika. It's no use and he has to retreat quickly, while the poor girl thinks she made him cry. Aww. :'D

(It looks like the "Chuckle" soundword isn't all too visible, though. Gotta be more careful next time...)

Taku snaps his edding shut while glaring down at Serika.

Kei: "W-What have you done!?"
Taku: "It's her punishment for sleeping on the job."

Serika finally wakes up and yawns.

Serika: "Mm... don't make so much noise..."

She sits up and rubs her left eye, smearing the edding marks across her cheeck in the process. Kei tries not to laugh at her and tries to hold back, but sleepy Serika misunderstands and thinks he is about to cry instead.

Serika: "Ugh... I must have fallen asleep..."
Taku: "We figured as much."
Kei: "Serika... I'm glad... that you're... okay..."
Serika: "Oh no, are you crying!?

Unable to hold back his laughing, Kei hastily runs out of the room.

Kei: "I'll wait outside...!"
Serika: "Keeei! I'm sorry! Wait!!"