Genius boy, ordinary girl.
Tsubasa Kazama is a genius, Kage Kazama is ordinary in every way.
They are twin brother and sister.
At the age of 13, Tsubasa Kazama died in a car accident; at the age of 16, Kage Kazama died in a plane crash.
Then, inexplicably, under the wrong leadership of Death God Hughes, they entered another time and space.
Welcome.
Welcome to the world of Kazama Shu.
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Summer memories....