No.6 Manga Pdf =link= -

Everything changes one stormy night when an injured boy, Nezumi (meaning "Rat"), crawls through a window into Shion’s room. Nezumi is an escapee from the city’s correctional facility—a fugitive from the "outside." Shion hides him, an act of kindness that costs him everything. His social status is stripped, and he is demoted to a lower district with his mother.