Kei x Yak: Abunai Aibo 5 (KCDX)

[Machine Translation] Public Safety and Yakuza, who are under a "sweetheart contract," can feel safe when they are with each other even on deadly missions. Prime Minister Osu finds out that Ichiro and Shirou are pursuing the truth behind a building bombing that took place 20 years ago. Prime Minister Osu calls Shiro in to prevent him from learning the truth about his son Tadashi's involvement in the case. Meanwhile, Ron Aterov, the Joker, the mastermind behind the building bombing, threatens to kill someone important to Ippolito, dividing Ippolito and Shiro. With the two under siege, further danger strikes Ippolito and Shiro...

「恋人契約」の公安とヤクザ、命がけの任務でも互いがいれば安心できる――。一狼（いちろう）と獅郎（しろう）が20年前に起こったビル爆破事件の真相を追っていることが大須（おおす）総理に知られてしまった。大須総理は、息子の匡（まさし）が関与した事件の真相を知られまいと獅郎を呼び出す。一方、ビル爆破事件の黒幕ジョーカーことロン・アテロフは、一狼の大事な人物への凶行をにおわせ、一狼と獅郎を分断する。四面楚歌の中、さらなる危機が一狼と獅郎を襲うのだが――。