Centuries have passed since the events of RefleX and mankind has once again attained civilization. Now, ancient technology born of a twisted mind sets in motion a chain of events designed to bring divine retribution down upon mankind.
The key to bring forth the annihilation is KAMUI, a fighter craft based on “Xaffiquel Theory” brain fusion technology. This twin-tined instrument of mankind's destruction carries a terrible secret that ironically will prove to be mankind’s only hope for salvation.
Kamui is a 2D vertical scrolling shooting game developed by Siter Skain and released by Himeya Soft at Comiket 57, on December 1999. Technically, the first game of the trilogy, but story-wise is the last chapter from The Tale of ALLTYNEX. Kamui considered by many as one of the best shooting game in history. As the spiritual successor of Taito’s Ray series, Kamui offers more intense and fast-paced gameplay. In June 2013 Nyu Media localized and published Kamui along with ALLTYNEX Second and RefleX into The Tale of ALLTYNEX. New in the English version is rotated display mode or “Tate Mode.”
As a tribute to Ray series, Kamui is armed with a shield (possibly based of the ZODIAC shield) and three weapons: Wide Pulse Laser, Lock-On Lightning and Thunder Laser. The fighter can attack both air and ground target using different weapons. Wide Pulse Laser is a Vulcan cannon that can upgrade to a spread shot. A good standard weapon for clearing small craft and missiles. Lock-On Lightning is a powerful homing laser that home in on multiple targets in the lower plane. Thunder Laser is a huge beam that does massive damage and neutralizes all enemy bullets.
While Lock-On Lightning and Thunder Laser are the most powerfull weapons, both are tied to thunder meter. This gauge tells player how much lightning energy is available. The higher the meter, more lock-on shots will be executed. However, each time Thunder Laser is used, it drains the Thunder Meter but does go gradually as opposed to the lock-ons beings nearly instant. Player must aware the meter status as it acts not only as a powerful weapon but an alternate shield for bullets.