Nothing to do with Ayumu's situation with 知ったことか

Grammar Explanation: Lack of interest with 知ったことか

Sakurako tells Takeru not to go to the shogi club as he’ll get in the way of Ayumu being with Urushi. However, as a new member of shogi club, and as a man, Takeru feels it’s his duty to show up.

タケル:: 「歩(あゆむ)の事情(じじょう)など知(し)ったことか」; “This has nothing to do with Ayumu's situation.”

Key Points

知(し)ったことか rejects concern
- 知(し)ったことか literally sounds like “is that something I know/care about?”
- In context it means Takeru is dismissing Ayumu’s circumstances as irrelevant to his own duty.
事情(じじょう) means circumstances or situation
- 歩(あゆむ)の事情(じじょう) is Ayumu’s personal situation with Urushi and the shogi club.
- Takeru is not denying the situation exists; he is saying it does not matter to him.
など adds dismissive distance
- など can mean “things like” and can make the noun feel belittled or brushed aside.
- That nuance fits Takeru’s exaggeratedly serious resolve to go anyway.