Young, free and madly in love. As teenagers, the world was their oyster—but, as adults, their lives seem dimmer, like a very important piece is missing.

Kenshin Himura goes up against mysterious weapons dealer Enishi. He controls the underworld of China. The secret of Kenshin Himura’s “Jujishou” is also revealed.

In the early 1990s, experiments were carried out secretly in Japan. Two different methods were used in the experiments. One method involved forcing stress upon expecting parents and when the baby was born, provoke the baby into mutations and develop their special abilities. The other method involved birth to babies having abilities of animals and insects. The special abilities were derived from gene manipulation. Subaru, Saya and others were born from those experiments.

Setoka Tachibana is a female high school student who has confessed her feelings to other boys 12 times, but has been rebuffed each time. Her older brother Haruka Tachibana cares for his younger sister deeply, but he keeps secret from her that they are not blood related. One day, Setoka’s first love Takane Serikawa appears after many years and approaches her.