Although she's very confident and comfortable in her own skin, Hana can also be a bit demure at times, especially when sharing emotional or intellectual intimacy. On a casual day, it's not unusual for Hana to leave her hair down, and being topless or nude is as natural as breathing - but here she's feeling a bit vulnerable and exposed without her collar. Sure, it's just a fashion accessory for day-to-day wear... but if one should ever meet her without it, they can trust that she feels an indescribable affection for them. Not generally one to ask for anything, with a deep blush and an uncharacteristically hesitant whisper, she might even ask if they'd like to give her a special collar she can wear just for them... to show how very special they make her feel.. and they would feel privileged too, knowing they're seeing such a rare and special side of her.