Also it feels like, at least for the people who knew Hiyama personally, or came in contact with him, that after everything he changed everyone even without the hypnotism. As shown esp. with Sonoyama, Yuka, and Miki.
sonoyama: http://www.mangago.zone/read-manga/lost_brain/mf/v05/c027/15/
yuka: http://www.mangago.zone/read-manga/lost_brain/mf/v05/c027/12/
Miki: http://www.mangago.zone/read-manga/lost_brain/mf/v05/c027/9/
They all admit their weakness led them to wanting change, and in sonoyama and yuka's case they admired Hiyama for being strong. After the fact they are inspired to change themselves through their own means.
I like the way that Hiyama wasn't in the last picture. It made me think back to the first chapters where he used the red paper to disappear. True to his word he refused to live in their world. One way or the other.
Besides the Obvious similarities to Death Note, I feel this manga still was original in it's story and characters. I can actually relate to Hiyama's desire to stop humanity's' weakness at the source, but of course the way he goes about it becomes morally twisted and conflicting. I really thought the way hypnotism was used was cool and scary at the same time. Also looking at the ending after reading a second time I like it's openess more than I did the first time reading; of course if there's a sequel I won't object but an open ending suits this manga really well.