Ranko Saegusa

The sisters' downstairs neighbour is a woman who constantly wears sunglasses and is apparently abysmally bad at housekeeping. It is unclear what kind of work she does, but she is apparently well-off, as could be seen when Kyō found a wallet Ranko had dropped. Asu is the only one to have seen Ranko without her sunglasses, which make her seem somewhat suspicious. Asu claims the 'neighbour onee-san' looks like a nice person without them. When she learns of the sisters' situation, she warms up to them, even lending Kyō one of her suits and fixing her makeup when the elder sister wants to look a bit more mature for Asu's school's open house.