Kelechi117's activites

I'm creating this list because i've read many incest manga's intentionally or unintentionally.so i thought of creating a list. 
True incest ( Blood related sis x bro) 
step bro x sis
step father x daughter
uncle x niece  
 twincest

Yamada is a castaway on an island without any ships passing by and he is unable to recall why he is ...