Picking Up is the 264th chapter of Kakegurui (Kakkokari), written by Homura Kawamoto and illustrated by Taku Kawamura.
Summary[]
Ryota receives a call from Mary. He picks up the phone, and Mary is angry at him because she thinks he should have picked up faster. Ryota is confused.
Ryota arrives in class. He learns there was a game about who will be the first to pick up the phone. Mary tells him that he’s the reason she lost. Ryota asks Mary how much she bet. She answers one million yen. Itsuki came in second, and Yumeko was first. Ryota guessed that Itsuki called Kaede, and he was right. Itsuki asks him how he knows. He responds that the two of them are always together.
Yumeko called Midari. She picked up within seconds. Yumeko went to the trouble of asking Itsuki for Midari's number. Even though she came in first place, Yumeko doesn't seem to be happy.