What made Sekiguchi embarrassed when she was asked about cram school? In episode 6, there is a scene where Daiku, a former team member of Igo soccer, is getting bored with their inactivity in their club room. The conversation follows like this (read from left to right): 







  Daiku: Oh come on, everyone said they had cram school and left...
  Daiku: And you're no fun, Sekiguchi
  Sekiguchi is reading a book silently
  Daiku: Don't you go to cram school, Sekiguchi?
  Sekiguchi flips a page, looks at Daiku, then continues reading the book silently while being embarrassed
  Daiku stares at Sekiguchi
  Sekiguchi is getting more embarrassed
  Daiku: You're joking!


Why was Daiku surprised all of sudden?

Relevant video on YouTube
She skipped cram school so that she could stay at the club. When he, being the last person left, asked about it and she blushed it implies she has a crush on him and wanted to spend time specially with him, he realised this and was shocked  ~ooh young love