Responses
well, "redrum retsis" is "sister murderer" backwards and in the corner of the page there is a note that says " That day I kept hearing voices telling me to dispose all the twisted, ugly things as if they were garbage.- Saya"
The underlined part reads あねごろし backwards which means sister murderer, writing it backward in English was the translators way of translating it :)
Can someone explain the underline words : http://www.mangago.zone/read-manga/transfigured_night/an/transfigured-night-chapter-1.html/35/
Must b important meaning behind it...too bad don't understand Japanese