Der Professor war früher selbst ein Handshaker, nur haben er und sein Partner sich getrennt. Und die Umstände dafür waren alles andere als erfreuliche
The menacing man introduces himself as Daichi Nagaoka, an old associate and former Hand Shaker partner of Makihara. He also introduces the white-haired girl beside him as Mayumi Akutagawa, who is none other than Koyori's twin sister. Koyori's sinister past is revealed through a flashback concerning both Makihara and Nagaoka, as well as the Akutagawa professors. Like Makihara and Nagaoka, the Akutagawa professors are Hand Shaker partners and scientists striving to discover the mystery behind Hand Shakers' existence. To help in their research, they draw one another into the Ziggurat (the two parties being two pairs of Hand Shakers) and there, Mrs Akutagawa gives birth to two white-haired twin girls: Mayumi and Koyori. Being born in the Ziggurat, the twins are naturally gifted Hand Shaker powers and become partners. While the Akutagawas are ecstatic with the success of their project, this soon proves to be a curse as the twins, being children, are easy targets. This also results in them unable to lose or let go of each other hands lest they die. The Akutagawas, filled with regret, slowly but surely get infatuated with the possibly of meeting God and killing him to protect their daughters and end this battle. It is also at this time when Makihara and Nagaoka stop being Hand Shakers as their relationship worsens and they lose their will to fight together. True to their word, the Akutagawa professors depart to kill God, but have never returned. Then Koyori and Mayumi abruptly lose all their memories, powers of speech and movement, and fall into a coma. Wishing to fulfil the Akutagawas' dream, Nagaoka kidnaps Mayumi and puts her on drugs, turning her into his Hand Shaker partner and leaving Koyori and Makihara for good. Returning to the present, Tazuna, Koyori, Mayumi and Nagaoka are drawn into the Ziggurat as they prepare to do battle.
M. Makihara, Tazuna et Koyori tombent par hasard sur Nagaoka, qui est accompagné de la sœur aînée de la jeune fille. M. Makihara sera-t-il contraint de révéler la vérité qu’il a longtemps gardée secrète ?
マキハラとナガオカはかつてハンドシェイカーであり、芥川博士夫妻の元で研究活動をしていた。芥川夫妻に双子の姉妹、檀・小代理が生まれる。しかし生まれながらのハンドシェイカーである姉妹は幼いころから戦いに巻き込まれ、マキハラたちが守らねばならなかった。娘たちを救うため神にまみえるという野望にとりつかれた芥川博士は最後の戦いを終えたあと、妻とともに姿を消し生死不明となる。夫妻の葬儀の日、姉妹は突然倒れ仮死状態になる。その後ナガオカはマキハラと袂を分かち、マユミをさらって消息を絶っていた。ナガオカから戦いを挑まれたタヅナとコヨリはジグラートに転移する。
Una volta, Makihara aveva un partner e un capo. Insieme svolgevano ricerche su Ziggurat e sul mistero della rivelazione di Babele. Ma la loro vita cambiò quando nacquero una coppia di Hand Shaker bambine.
