I'm glad you're doing your research first, in that case.

[Ah yes, the date. Hakkai absolutely refuses to consider the question of whether Chikusa and Ken being on a date has anything to do with his own willingness to not tell Ayumu no and send her home that evening.

(Refuses, that is, in the sense that he has thought about it and then decided not to think about it any longer.)

He turns back to the sink.]

If you have specific questions, there are reliable resources online.