TGAK chap 274 SPOILER
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While sitting and chatting idly, Shiki realizes he's enjoying the relaxation a bit too much, so he says they need to hurry up and get to Sakurajima. However, Kyouya points out:
"When you get too used to endless days of constant fighting, you start to feel guilty whenever you want to rest and relax. That exact feeling will slowly wear you down, turning your heart hardened and prickly, until at some point, you end up hurting both yourself and the people around you. That's why, whenever we actually can rest, we must enjoy it to the absolute fullest. Nurturing your soul also means knowing how to cherish and love yourself."
Shiki: "...This playboy teacher, he looks so flaky but sometimes he actually drops some incredibly profound and on-point words!"
Kyouya: "Though to put it bluntly, the main reason is just that I really want to go sightseeing~"
Kyouya: "A school doctor teacher who is both 'serious' and yet completely carefree. That is who Oiranzaka Kyouya is. Just because we are Oni doesn't mean we have to sacrifice our own happiness... I don't want you to become a pitiful kid like that. I'm sure Danocchi thought the exact same thing, which is why he let me come with you..."