Board Thread:General Discussion/@comment-4436931-20180928004853/@comment-24708868-20181006213844

Goodwizard wrote: I think they want to mislead us.

In the VA credits, the young-younger one was listed as Ichihoshi's younger brother but the young-older one was not listed. (The present Mitsuru has a different voice actor from his young self.)

Maybe Ichihoshi's younger brother and Mitsuru is the same one and they didn't list young-older one's VA on purpose. That's an interesting idea. So basically, they called him Ichihoshi's younger brother because they don't want to mention Mitsuru's brother's first name and if Mitsuru is indeed the younger one.