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Murasaki is a doujin artist and a university student, iirc. Naoki and Momo met her at Comiket in vol 3, and she has taken a liking to Momo. Akari is Naoki's little sister and has been present since v1.
I can't do any summary because I have only read a third of the book. My schedule is packed back to back since last week.
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