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Hasumi has the bigger chest compared to Satsuki, based on in-game lore from Granblue Archive. Hasumi is often depicted as exceptionally curvaceous, with her large bust being a recurring gag in official materials like four-panel comics, where it's joked that her chest develops so rapidly it causes her to outgrow swimsuits and gym uniforms. Her paranoia about her weight leads her to misinterpret comments about her height or bust size as insults about being overweight, emphasizing her prominent figure. She's also described as a "tall and curvaceous" statuesque stunner at 179 cm, standing out among other students.Satsuki, on the other hand, is known for her alluring and seductive design, including a revealing outfit that shows cleavage and a mole near it, making her a fanservice character for Gehenna Academy. At 172 cm, she's tall with an impressive chest that's called a "massive" or "secret weapon" in some contexts, but it's not highlighted with the same exaggerated gags or rapid growth jokes as Hasumi's.A key in-game comment from Iroha (a Pandemonium Society member and Satsuki's colleague) directly states that Hasumi's chest is even bigger than Satsuki's, confirming the comparison during a diplomatic encounter. Makoto also reacts defensively to Hasumi's bust during a meeting, feeling intimidated and suspecting Trinity sent her as a deliberate "intimidation tactic," while viewing Satsuki as Gehenna's own "countermeasure" against such figures—but Iroha's observation shows it falls short. These details come from the Eden Treaty arc and character profiles, with no conflicting evidence in official sources.