In this story all the male employees are tense around Chiharu while all the women keep throwing themselves at him. Kazuki decides to host a drinking party, and you would think it was for everyone to see that Chiharu is just like everyone else. Kazuki really just wanted to see Chiharu jealous. Kazuki had the tables turned on him when after Chiharu arrived all the women went to him, flirting and touching him. This pissed Kazuki off when Chiharu didn’t tell them to stop. After the party ends, Kazuki slaps him though they still end up having sex. Kazuki admits he's being a brat and wanted to make Chiharu jealous but Chiharu warns him he doesn't want to see him jealous.
Kazuki is approached by one of the women in the secondary department to plan another drinking party, and he does but, Kazuki doesn't invite Chiharu this time. Chiharu reminds Kazuki he can't hold his liquor and to be back by nine. Although Kazuki decides not to drink, he accidentally falls asleep and goes home the next morning. When Kazuki arrives home, Chiharu is waiting and he's so furious and doesn't allow Kazuki time to explain why he was out all night. When Kazuki tries to touch Chiharu he pushes him away and leaves.
Kazuki doesn't know what to do, having never seen Chiharu so mad, who has completely stop talking to Kazuki and coming over. Kazuki begins to think that Chiharu doesn't want him anymore, never having gone without Chiharu’s love. Chiharu, on the other hand, is working everyone, including himself, ragged. Jin decides to do something about it, driving Kazuki to the hotel Chiharu is staying at to fix things between them. When the two meet again, Chiharu tells Kazuki to go home, but he barges in instead, crying thinking he's hated by Chiharu. Chiharu explains that his jealousy is too great and if Kazuki even talks about being with another man as a joke, he'll lose it. Chiharu can't get enough of Kazuki so he left thinking he wouldn't be able to control himself. Kazuki tells him he wants everything about Chiharu, positive or negative. They are both jealous run men who want control of the other. Chiharu talks about killing any guy that ever gets with Kazuki. Kazuki tells him to kill him then himself so they can always be together.
Towards the end we get a little up date on Jin and Jun who have been having a hard time meeting due to work.
Kemono Series:
1. Happy Yarou Wedding — Toudou Akira (teacher/seme) x Yuuhi (student/uke) + Shouta (Akira's son)
2. Utsukushiki Kemono-tachi (Beautiful Beast) — Saijou Chiharu (Kazuki's tutor/secretary to Pres. of Toudou Co./seme) x Toudou Kazuki (younger bro of Akira/heir of Toudou Co./uke)
3. ...Virgin Love — main: Daigou Mikihisa (director of Mercury Co./seme) x Kirishima Kaoru (uke/cousin of Chiharu/works at Toudou Co.), & a bit more of Chiharu x Kazuki
-Hot Milk (doujinshi/extra) — Daigou x Kaoru
4. Toriko ni Natta... Kemono (Crazy for You) — main: Chiharu x Kazuki, & a bit of Daigo x Kaoru
5. ...Junai no Seinen (The Young Person's Pure Love) — main: Daigo x Kaoru, & a bit of Chiharu x Kazuki
6. Kemono wa Ai de, Iyasareru. (Smooth over his hurt feeling) — main: Chiharu x Kazuki, with a bit of Daigo x Kaoru (c6)
-Iyasaretai Otoko (doujinshi/extra) — Chiharu x Kazuki
7. Playboy Amour. — main: Ian Evans (Pres. of Evans Co./Kaoru's ex/seme) x Sanada Manabu (Ian's secretary/uke), with a bit of Chiharu x Kazuki (c6)
- Romance no Kaori (doujinshi/extra) — Chiharu x Kazuki
8. Oboreru Kemono no Koibito — Chiharu x Kazuki, introduces Jin Kyotaro who's brought in to mentor Kazuki
9. Mens Love — Daigo x Kaoru
10. Aikata — main: Jin Kyotaro (Pres of Jin Co./intelligence for Toudou Co./seme) x Saiki Jun (college student/hacker for Jin Co./uke), with a bit of Chiharu x Kazuki (c5-6)
11. Ueta Aikata — Jin x Jun, set mostly before Chiharu x Kazuki was a thing (c1-4)
12. Amaeta Kemono no Shitsukekata — Chiharu x Kazuki, with a bit of Jin x Jun (c5-6)
13. Torawareta Amai Kemono-tachi
14. Aikata no Aishikata
-Kazuki Mania
15. Kemono no Marking
16. Erotic ni Kojiakete
Amaeta Kemono no Shitsukekata