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Sei Kai
Chinese Cheng Hui
Kanji 成恢
Romaji Sei Kai
Biographical Information
Deceased (Slain)
Marital Status Single
Age 30s
Gender Male
Hair Unknown
Skin Grey
Light (formerly)
Distinction Black Veins all over his body
Relatives N/A
State Han
Residence Mobile
Location Kankoku Pass (Death Place)
Professional Information
Classification Army Commander
Occupation Soldier
Affiliates Han Military
Sei Kai Army
Coalition Army (Defunct)
Military Rank Great General
Equipment Sword
Manga Debut Chapter 268
Anime Debut Episode 79

Sei Kai was a Great General from the State of Han.


Sei Ka's former appearance

Sei Kai was said to be a beauty in the past that made even men attracted to him. After his various experiments with poison, his face became marked with black veins and his eyes black.


Venomous flora, fauna and minerals

Sei Kai's reach had extended all the way to far-flung worlds to accumulate all the venomous flora, fauna and minerals he could get his hands on. He would spend day and night steeped in his research, continuously mixing and distilling until he devised unique poisons to be used for martial purposes.

It is said that Sei Kai was originally a man of such beauty that even other men would find themselves enamored with him. His overly zealous dedication to poison research had resulted in the poison steeping into his own body. There was not a single man under his command to be sound of body. Over a hundred of his men had died in the name of his science, and even those that survived did not emerge unscathed.


Coalition Invasion Arc[]

On the 7th day of the Battle of Kankoku Pass, Sei Kai moved in with his Poison Weapons Corps to target the Qin commanders positioned atop the wall. Upon finding their location, he ordered them to fire the Tangan and retreat back to HQ when it strikes Chou Tou's location.


Strength 50
Leadership 86
Intelligence 88
Experience C
Is seriously very beautiful

Strength 50
Leadership 86
Intelligence 88
Experience C
Is seriously very beautiful

Strength 50
Leadership 86
Intelligence 88
Experience C
I'm a poisoner, so what?

Sei Kai was an average commander with no military experiences. Despite that, he was the commander-in-chief of Han army during the coalition war against Qin, indicating his talent.

Physical Abilities[]

Sei Kai does not possess any talent in martial skills as he preferred to run away from battles.


Sei Kai possessed an average leadership and was able to command men in battlefields.

Tactical Abilities[]

Poison: Sei Kai researched poison from different animals, insects and plants found both inside and outside of the borders of China and was able to produce deadly mixtures. One mixture kills fast when it wounds its targets and was therefore used by his archer troops. Another mixture kills slowly and was used as a gas contained in spheres, which were shot by ballista's to the enemy and wouldn't have any obvious effect until eight days later.


What foolish drivel. Poison is a tried and true weapon when it comes to efficiently killing humans. It is not to be twisted by the nonsensical logic of some senile old soldier.

(Chapter 303, page 7)


Seikai color.png
Sei Kai on volume 27 back cover
Sei Kai's face
Sei Kai's death.PNG
Se Kai's death at the hands of Chou Tou

Royal Palace
Royal Family Rou Ai - Queen Mother

Government Chou Kou - Ko Reki
Generals Current
Han O Ki
Wa Tegi

Commanders Han Roki - Ha Mui - Bu Tai
Royal Palace
Royal Family Formerly
Shou Hei Kun

Government Shun Shin Kun
Great Generals Kan Mei - Ka Rin

Generals Formerly
Rin Bu Kun

1000-Man Commanders Haku Rei - Kou Yoku
Great Generals Sei Kai

2000-Man Commanders Formerly
Leader Jo Elder

Civilian Shuu (Jo)
Royal Palace
Royal Family Ou Ken
Generals Ganmo
Royal Family Current
Ei Sei - Queen Mother - Rei - Rui
Boku Kou - Sei Kyou - Sho - Sou Jou

Government Current
Ri Shi - Ryo Fui - Sai Taku - Shi Shi - Shou Hei Kun - Shou Bun Kun
Ketsu Shi

Royal Harem Amin - Chou Kou - Kou - Rou Ai - You
Great Generals Current
Mou Bu - Tou
Chou Tou - Duke Hyou - Mou Gou

Six Great Generals:
Ko Shou - Kyou - Haku Ki - Ou Ki - Ou Kotsu - Shiba Saku

Generals Current
Do Mon - Heki - Kan Ki - Kan Ou - Ou Sen - Roku O Mi - Ryuu Koku - Shou Kaku
Dou Kin - Ei Bi - En Ka - Koku Gou - Ra Gen - Rin Bou - Ryuu

5000-Man Commanders Ou Hon - Shin

3000-Man Commanders Kyou Kai

2000-Man Commanders Mou Ten

1000-Man Commanders Curent
Hoku Shu - Gaku Rai - Kaku Un - Kan Jou - Ogiko - Ran Dou
Baku Koshin - Jou Han - Kaku Bi - Tai Un

100-Man Commanders Chu Tetsu - Den Ei - Den Yuu - Hai Rou - Kyo Gai - Ryuu Sen

10-Squad Leaders Bi Hei - Ro En - Ryuu Yuu - Seki - Suu Gen - Taku Kei

5-Squad Leaders Former
Batsu Ken - Bi Tou - Bun Ketsu - Hou - Kyou Ji - San Ka - Yuu Gi

Strategists Ka Ryo Ten - Kai Oku - Mou Ki
Mountain Tribe
King Yo Tan Wa

Elders Chouga Elders

Warriors Ba Jio - Fuji - Rankai - Shunmen - Tajifu - Toji
Royal Palace
Royal Family Kei Bin
Great Generals Current
Go Hou Mei
Seven Fire Dragons:
Gai Mou
Go Kei - Tai Roji - Shi Ei - Rei Ou - Shou Sen - Ba Tou

Generals Current
Fuu Haku - Kan Ei
Kyuu Gen - Haku Kisai - Ga Gyuu - Rinko - Gen Bou - Kyou En - Kai Shi Bou

1000-Man Commanders Former
Dou Sei

Strategists Hyou Ki
Great Generals Current
Geki Shin - Gaku Ki
Royal Palace
Royal Family Tou Jou
Great Generals Three Great Heavens
Ri Boku - Hou Ken
Rinshoujou - Ren Pa - Chousha
Gaku Jou

Generals Current
Kou Son Ryuu - Ri Haku - Ki Sui - Ba Nan Ji - Shuu Sui Ju
Man Goku - Shou Mou - Fuu Ki - Rin Ko - Gen Bou - Kyou En - Kai Shi Bou - Kei Sha

Army Commanders Current
Ba Tei - Kin Mou - Gaku Ei - Kai Gou
Ryuu Tou

1000-Man Commander Gou Ran

Strategists Chousou

Commanders Kaine - Fu Tei

Others Gika

Merchants Former
Ryo Fui - Shi Ka - A Mon - Kou Shou