Thread:Singsweet23/@comment-33561080-20160830232056/@comment-31402001-20160831011618

I can answer that: in Episode 8 Aoi talks about Komaru and Makoto having a good sibling relationship and Makoto begins to mention that her brother is dead, but they are cut off before they can finish.

To add however, considering Yuta's death is known by Komaru, Toko and Hiroko, it's not that surprising she knew about it.