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Under the guidance of Nazuna Nanakusa, Ko enters a "training arc" to intentionally trigger and control his transformation. Initially, they believe is the key emotion needed to activate his powers, leading to several humorous attempts to make Ko "mad".

: Nazuna tries various ways to provoke him, but Ko finds it difficult to manufacture genuine rage on command. Under the guidance of Nazuna Nanakusa, Ko enters

: 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" : Anko Uguisu (the detective) suggests that Nazuna

Chapter 107 transitions the story from a slice-of-life "night walking" mystery into a more focused narrative where Ko must actively develop his strength. It solidifies the bond between Ko and Nazuna as student and mentor, while simultaneously building tension for the inevitable confrontation with Kiku Hoshimi and Mahiru in the subsequent volumes. [DISC] Yofukashi no Uta - Chapter 107 [DISC] Yofukashi no Uta - Chapter 107 While

While Ko and Nazuna are busy training, the story shifts to Ko's other friend, Akira Asai. In a classic comedic subplot, Akira is dragged along by Midori and ends up being forced into a at a maid café.