Warui Series

V10 [2-4]

Featuring Shūji Yukimura, the formidable student council vice-president, and the problematic childhood friend, Ryuichi Shinonome (Towa's friend). (Pair 2)
Volumes involving this pairing are:
V.03: Kirai Ja Nai Kedo
V.05: Koi Ja Nai Kedo
V.08: Kare Ja Nai Kedo
V.10: Sunao Ja Nai Kedo
V.14: Himitsu Ja Nai Kedo

V11 [1-5]

Featuring the school delinquent Towa Aikawa and the student council president Mikado Shirahane. (Pair 1)
Volumes involving this pairing are:
V.01: Warui Koto Shitai
V.02: Warui Ko Demo Ii?
V.04: Warui Yatsu Demo Ii
V.07: Warui Koibito Ja Dame?
V.11: Warui Ouji Demo Suki

V12 [3-3]

Featuring Nanao Shirahane (Mikado's older brother), a male siren, and Kuon Aikawa (Towa's older brother), a fellow student attending the same university. (Pair 3)
Volumes involving this pairing are:
V.06: Mujihi na Otoko
V.09: Mujihi na Anata
V.12: Mujihi na Karada

V13 [4-1]

Featuring former student council president, Shirō Akagi (Mikado's rival in Warui Koibito and Warui Oujii) and disciplinary committee member, Nao Kousaka (Yukimura's rival in Sunao ja Nai Kedo). How will those two damaged people find their respective love? (Pair 4)
Volumes involving this pairing are:
V.13: Shouwaru Ookami ga Koi o Shita Rashii

V14 [2-5]

Featuring Shūji Yukimura, the formidable student council vice-president, and the problematic childhood friend, Ryuichi Shinonome (Towa's friend). (Pair 2)
Volumes involving this pairing are:
V.03: Kirai Ja Nai Kedo
V.05: Koi Ja Nai Kedo
V.08: Kare Ja Nai Kedo
V.10: Sunao Ja Nai Kedo
V.14: Himitsu Ja Nai Kedo