Minamoto no Raikō is a legendary Japanese hero known for defeating the demon Oniwarai. In this chapter, she is mentioned as another alternative Heroic Spirit that Nanaya considered. She is described as perfect in many ways—human, powerful, and specifically effective against Ibaraki Dōji. However, she is also a Berserker, which means that to unleash her Noble Phantasm, Nanaya would have to synchronize deeply with her. The higher the synchronization with a Berserker, the easier it becomes for Nanaya's consciousness to be overwhelmed and replaced by the Heroic Spirit's personality. In Raikō's case, her bouts of madness are caused by maternal affection, which Nanaya, as a man, does not want to be associated with. Minamoto no Raikō is female and is mentioned but not summoned in this chapter.
