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The story focuses on the protagonist's relationship with his girlfriend's sister, (played by Nanatsumori Riri).

Siblings fight, they compete for space and status, and they often use their physical traits to assert dominance. But at the end of the day, those relationships are often "patched" back together. The taller sister might use her height to tease, but she also uses it to shield. Why This Narrative Resonates

The story follows a protagonist who finds himself intimidated yet fascinated by his girlfriend's older sister, Marin. The narrative leans heavily into several specific character archetypes: