"Well, we already have an Iron Heart in Seirin, so I'd rather not enroach there."

He does smile softly at Kise's suggested reading. "I'm partial to these kanji," he shows an example on his own phone, 徹夜. "Even though it's a common word. An all-night vigil or a sleepless night. The liminal space of an endless evening. It feels a bit mysterious, in that way."