Comments of Knockin' On Your Door

Masaki is a really interesting, complex, tragic character. His actions have a through line, even as unconscionable as they are, he feels roundedly motivated. Kunihiro is unflappable and adorable honestly, dense fucker (affectionate), watching him grow into himself, despite the Problematicisms, it's a fun time

This story would have been great if it didn't have f*ckin rape.

was in vol 9 in koisuru (no continuation of these two)

Side story that features Kunihiro and Masaki from Koisuru Boukun (student x professor)

spin off - Koisuru boukun

*sparkly sparkly eyes

alrd included in Koisuru Boukun: vol 9 ch6.2 extra, related series:
-- 1. Challengers (Koisuru Boukun adapted form)
-- 2. Koisuru Boukun (spinoff to Challengers, main story where Knockin on Your Door is based)
-- 3. Knockin on Your Door (side story to Koisuru Boukun)
a sequel to 'Bokutachi no Shippai' or 'It is our Failures' story of kunihiro (morinagas big brother) & masaki included in the main series

This is already included in the main Koisuru Boukun upload. It's Vol.9 Ch.6.2.

Series timeline
1)Koisuru Boukun - story of Tetsuhiro x Morinaga
2)Knockin' On Your Door -features Kunihiro and Masaki