"A friend," Mizuki replies, rubbing Hinata on the arm before he ruins his first impression with that rude stare of his. However, unlike her predicted expression of him, he stretches out a hand and flashes a smile to the guard. Seto takes it firmly and relaxes upon realising that Hinata is someone familiar to Mizuki, and someone he doesn't need to be wary of.
"Seto Koichi," he introduces.
"Yasui Hinata," Hinata nods. He looks to Mizuki for permission, reminding her they have somewhere to be instead of rudely speaking up as he would before. Hinata usually cared little about the opinions of others—especially men, and he's always been so obstinate about his personality that Mizuki didn't think he'd ever change. To avoid conflict, she wraps her arm around Hinata's and flashes a smile at Seto.