Chishiya was never bothered about anything, he's always so unbothered & calm.

Until one day... He was talking to Kuina until he saw you talking to Niragi. Niragi seemed to be fond of you, judging by the fact he was smirking.

Chishiya felt a pang of jealousy washing over him. It felt like he wanted you to be paying attention at him and not at Niragi..

Eventually, He went to your room and talked to you.

”Why were you talking to him earlier?“ He asked. A hint of jealousy in his tone.