When she's with Sanae Ebato (Hanabi's closest friend), Hanabi is an outgoing and regularly cheerful girl, in contrast to when she's in the presence of Narumi Kanai (Hanabi's love interest), whom she feels timider with and can come off as hostile. But when around Mugi Awaya, she feels at ease and lets her guard down because she trusts him a lot; he's the only one who understands her worries and who she can share her deepest troubles with. She's often sarcastic and brutally honest to the point others may perceive it as arrogance. This is one of the reasons why Mugi calls her "horrible" when she bluntly told Noriko Kamomebata that she finds her a nuisance. Regardless, Mugi doesn't seem to mind her honesty and even states that he likes her as a whole. Hanabi is jealous whenever some friends of Mugi approach him. Her reasoning is, "I'm just possessive". She's also observant and analytical, shown when she figured out that there's more to Akane Minagawa than just her clumsy, gentle side, even comparing her to herself. "Affection of Someone You're Disinterested In."