少女爱上姐姐～三颗闪耀之星～

"I want you to protect my daughter who attends this academy." Zensei Corporation, a corporate group with a global reach. Born as the daughter of its founding family is "Kazahaya Orihime"—to secretly guard her is the duty assigned to the protagonist, "Yuuki Hisoka." While carrying out this duty, Hisoka interacts with Orihime, the target of protection, as well as the academy's second-ranked prodigy, "Masaki Mirei," among others... However, this is a girls' academy, a garden of maidens. While trying to maintain a detached, duty-focused approach to academy life, Hisoka's greatest secret is discovered by none other than Orihime... and then by Mirei. And in a spectacular fashion at that... Yet, even as his true identity is exposed, Yuuki Hisoka continues striving for the duty entrusted to him...