Talk:Asahi Kasumi/@comment-29443509-20160804165121/@comment-26426093-20160810040300

He's older than Mahiru; if I recall Mahiru is the youngest member of the Kasumi family, and there's no information that points towards the two of them being twins, at least for now, so it's assumed that he's older than Mahiru by at least a year.

Also, ~yep, and she will become Mahiru's sister-in-law as well. Oh, and Koharu gets to change her maiden name to Kasumi, aka the family name that's she's super obsessed with.