Introduces Ryuuki and his fixation on Kirill-sama. The episode establishes the central mystery of how Reiko and Kirill are linked through a scientific serum that Reiko developed to manifest her suppressed urges.
Walking through the familiar streets of my hometown, everything seemed different. The park where I used to play soccer with friends, the small river where we would swim to cool off, the ice cream shop that always had a smile ready for me—now all seemed like relics of a bygone era. shounen ga otona ni natta natsu cap 1 2 3 sub link
The sun beat down on the small town of Kakamura, casting a warm glow over the streets and homes. For 14-year-old Takeru, it was just another summer day, filled with endless possibilities and adventures waiting to happen. Little did he know, this summer would be one that would change his life forever. Introduces Ryuuki and his fixation on Kirill-sama
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The series opens with protagonist Kaito , a 16-year-old high schooler, reflecting on the summer that changed his life. Instead of a typical "training montage," the chapter focuses on subtle shifts: his strained relationship with his father, a part-time job that tests his patience, and a growing realization that childhood naivety is slipping away. The art style here is sharp, with warm, summery hues contrasting against Kaito’s internal monologue.
It is revealed that Kirill is actually a persona created by his sister, Reiko. A chemical genius, Reiko uses this carefree identity as an outlet for her repressed feelings for Ryuuki.