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: Ryuuki’s "Cool Big Sis" who is a brilliant scientist but unkempt in her daily life. She adopts the Kiriru identity to connect with her brother in a way she feels her true self cannot.

: Introduces Ryuuki’s isolated life and his sudden infatuation with the mysterious Kiriru, culminating in their first unexpected meeting. shounen ga otona ni natta natsu cap 1 2 3 sub top

: Often cited for its high emotional stakes, this chapter follows the characters as they navigate their feelings during a storm alert, leading to critical revelations about their identities. Where to Watch and Reception : Ryuuki’s "Cool Big Sis" who is a

The plot takes a surreal turn when Kiriru appears in person, leading Ryuuki down a path of discovery that challenges his perceptions of family, identity, and adulthood. A major twist in the story reveals that the glamorous Kiriru is actually a persona created by his sister, Reiko—a chemical genius who used her skills to create a "mask" that allows her to live out her desires without social repercussions. Key Characters : Often cited for its high emotional stakes,