Kemono series

(1)
Tsuzaki Yuuhi x Toudou Akira.
Introduces also Saijo Chiharu x Toudou Kazuki.

(2)
Kazuki x Chiharu.
Introduces also Kirishima Kaoru.

(3)
Kirishima Kaoru x Daigou Mikihisa.
Saijo Chiharu x Toudou Kazuki.

(4)
Chiharu x Kazuki.
It also follows up Kirishima Kaoru x Daigou Mikihisa, Toudou Akira x Tsuzaki Yuuhi.
Introduces Ian Evans.

(5)
Daigou x Kaoru.
A side story about Chiharu x Kazuki.

(6)
Chiharu x Kazuki.
Chapter 6: Daigou x Kaoru.
Introduces Saiki Jun x Jin Kyoutaro.

(6.5)
Chiharu x Kazuki.

(7)
Evans x Manabu.
Chapter 6: Chiharu x Kazuki.

(8)
Chiharu x Kazuki.

(9)
Daigou x Kaoru.