Boy's Abyss manga volume 4 features story and art by Ryo Minenami.

When Gen reveals a shocking secret about Reiji’s mother, he kicks into high gear in his determination to save her. But does she really need saving? Then, Reiji finds it’s not as easy to extricate himself from his illicit affair with his teacher as it was to fall into it. Plus, he and his nerdy friend Chako grow closer... and closer...