It targets the common trope of the "beautiful older neighbor/tutor" who takes an interest in a younger man.

Katekyo -Kireina Onesan to Himitsu no Lessons- (家庭教師 ～きれいなお姉さんと秘密のレッスン～) is a Japanese adult visual novel or eroge title focused on the "tutor" (katekyo) and "older sister" (onee-san) archetypes.

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