Thanks to his father's soul, Takeru is still free to collect the 15 Ghost Eyecons once more, and by doing so, he can also bring his father back. But first, he encounters the soul of Sakamoto Ryōma, who poses a challenge for Takeru before he willingly joins him, which he describes as a "Satchō Alliance". Along the way, Takeru must deal with a new Gamma, as well as the return of the Katana Gamma.