Namaiki na Seito Kaichou no Himitsu o Abake ~Sumaho ni Virus o Shikakete Yaritai Houdai~

Fuyumi, the student council president, ridicules the protagonist for being an otaku. One day, after being embarrassed in front of his class, the protagonist vowed to exact revenge on her. He installed a virus in Fuyumi's phone, which allowed him to hack into the camera of her phone. It was developed by a friend he got acquainted with online. Just after he started his surveillance, he immediately got hold of a blackmail material. Next day, he showed that recording of Fuyumi, who turned pale, and then demanded something from her... [Translated from Official Site]