don't read here study instead's activites

-this list is the 2nd part of manga stories with beautiful art 
1st part:
aesthetic & unique art-styles (manga) non-BL/GL 
https://www.mangago.me/home/mangalist/1855865/

Yuuya got Sensei on hand by which he killed Mariko, then how did Mariko kill Sensei to get him on her chest...hm?