est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Vampire vs. vampire, with humanity in the balance! The destinies of two people, along with the fate of the world and its inhabitants, are about to become intertwined when, on a rainy night in California, Osamu encounters a capsule that holds a mysterious green-haired being. He soon finds himself in the middle of a power struggle, as warring factions of vampire aliens descend to Earth. On one side are those who seek to use the recovered alien-Kimera-to repopulate their dying race. On the other side is Kimera's former mate, who wishes to kill him. Will humanity face total destruction, or will Kimera be killed, ultimately saving the world?
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections
Volumes
Zero comics First edition
2vols · 1995-03〜1996-06
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Bad Teacher's Equation
腐った教師の方程式
1993 · こだか和麻 · 20vols
Boys' LoveComedyLove TriangleSchoolAge Gap
Border
BORDER境界線
こだか和麻 · 12vols
Boys' LoveActionDrama
Kizuna: Bonds of Love
KIZUNA
1992 · こだか和麻 · 10vols
Boys' LoveAdult
Sebiro no Housekeeper
背広のハウスキーパー
1995 · こだか和麻 · 3vols
Boys' LoveComedyRomance
Midare Somenishi
乱れそめにし
1999 · こだか和麻 · 3vols
Boys' LoveAction
Aim to be a Hero!
めざせHERO!
こだか和麻 · 3vols
Boys' LoveComedyDramaAge GapPolice
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Lovers' Kiss
ラヴァーズ・キス
1995 · 吉田秋生 · 4vols · Shōjo
Boys' LoveDramaLove TriangleSchoolRomance
Tenjou no Ai Chijou no Koi
天上の愛地上の恋
1995 · 加藤知子 · 12vols · Shōjo
Boys' LoveDramaPsychologicalRomanceHistorical
Itsuka Suki da to Itte
いつか好きだと言って
1995 · 水城せとな · 1vols
Boys' LoveSci-FiDramaRomance
1999-nen Shichi no Gatsu: Shanghai
1999年七の月～上海
1995 · 水城せとな · 4vols
Boys' LoveRomanceTragedyHistorical
Shoubu wa Toki no... Un Daro?
勝負は時の…運だろ?
1995 · 高口里純, 藤崎一也 · 8vols
Boys' LoveSportsDramaBasketballRomance
Tsuki no Hikari Hoshi no Michi
月の光星の道
1995 · Lee · 1vols
Boys' LoveFantasy