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: Fans have affectionately dubbed this Akira's "maid boost".

Call of the Night Chapter 107: The Half-Vampire Training Arc Begins : Fans have affectionately dubbed this Akira's "maid boost"

: Anko Uguisu (the detective) suggests that Nazuna possessing Ko's blood might be the biological anchor or trigger for his unique state. Akira’s Unintentional "Maid Boost" : Fans have affectionately dubbed this Akira's "maid boost"