— ヘンペック × kokoinu

Seishu and Kokonoi are childhood friends. Koko was in love with Seishu's older sister, Akane. When the Inuis' building caught fire, Koko saved Seishu thinking he was Akane. After Akane's death, Koko stayed by Seishu's side. Together, they recruited Taiju Shiba to reform the Black Dragons. When Taiju Shiba lost to the Tokyo Manji Gang, they both joined Hanagaki's 1st Division, thus merging the two gangs. Later, they were captured by Mucho. To save Seishu and Hanagaki, Koko agreed to join Tenjiku.