Sister Scheme 2  

しすたー・すきーむ2

Shiori possesses two older siblings named Amane and Misaki. Due to the perception that he harbors a sister complex, he adopts an aloof demeanor towards them. However, one day, he receives an email with a threatening message requesting him to send a photo of himself and his sisters sharing a kiss at school. If he fails to comply, his secret will be exposed to the public.