From KyoZaNa: The Gay Bar Related Series Timeline
1 Pinup Boy - A bar staff wears lingerie, Hajime x Masaki, mama's nephew
2 Otoshiana ni Hamerarete - A Cross-dresser Seme, Shouta x Hiroto
3 Yoru Mo Hi Mo Akenai - Mama of the bar, Yoshio x Yakuza Tenma
4 Mayonaka Love Alliance - Continued story of the couples in 1 & 2
Volume 2 chapters 1-2: insecured that lover will leave, gave in to suggestions including using of drugs which eventually harm the partner.
Chapters 3-4: Hajime's former highschool friend who is selling drug goes to disturb him.
Chapter 4.5: extra from mama & lover + masaki & hajime.
Mayonaka Love Alliance