BLdokidoki's manga / #Complete(1792)

Lost Letters series: Match Uri / The Match Seller (1 Volume) Yagi-san Yuubin (3 Volumes) > Two couples: > Uni student, Hirose x The Match Seller, President Seiji // Older Uke // Traumatic Past > Hirose's fellow uni student, Arihara (who wrote the letter to Hirose) x Seiji's colleague, Sawa // Older Seme // Blackmail (Sawa has now Arihara's letter into his hands)