In episode 7, everyone's out eating and drinking at the izakaya, and Denji explicitly mentions he's only drinking tea:
However, later in that episode, he is apparently passed out and Himeno takes him on her back back to her apartment. Later, he wakes up in her bed and says he's dizzy.
Do we know why he passed out, and why he was dizzy? Did he get intoxicated from the vomit he swallowed earlier from the kiss with Himeno, since she had been drinking heavily? Or was there some other reason for his passing out and dizziness?