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The protagonist's underclassman in the same year as Satoko.
Unsuited to her age she has a calm, quiet personality, and is the complete opposite of Satoko, but the two of them are together often.
She's always comforting Satoko who's half-crying from losing a battle with the protagonist.
When the protagonist loses, she comforts the protagonist.
When Rena gets teased, she comforts Rena.
When there's nobody for her to comfort, she searches for someone to comfort and then comforts them.
She seems happy.