Responses
Yes, but only briefly. He was in Chapter 3 (Pages 42-44) and he was shown in Chapter 5.2 where all the alters got introduced.
http://www.mangago.zone/read-manga/adam_no_rokkotsu/uu/to_v-1-chapter-3/pg-42/
http://www.mangago.zone/read-manga/adam_no_rokkotsu/uu/ibx_chapter-7/pg-2/
I have a question....
Is mika ever appeared before??