Also known as: 86-エイティシックス-フラグメンタルネオテニー, フラグメンタルネオテニー
A spinoff manga of 86 -EightySix-, illustrated by Shinjou Takuya. The manga adapts and shares it's name with the 10th volume of the light novels, which collects various short stories about Shinei Nouzen's youth and earliest missions.