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I'm Sure She's a Lovely Lady!
きっとステキなお姉さん！
A man finds a hidden love letter inside a borrowed book. The note is signed by a mysterious woman who calls herself "Onee-san." Intrigued, he begins searching for the sender, hoping to discover her identity and the meaning behind her words.
As he follows the clues left in the letter, he becomes entangled in a web of romantic misunderstandings and secret desires. The more he learns about the elusive Onee-san, the more he realizes that the truth may be far more complicated—and exciting—than he ever imagined.
