The highest walls are built by those who have the most to lose.

Akihiko Kageyama's world is woven from paranoia, strict discipline, and old scars. Taking on the responsibility for his family after his parents' death, he hardened into a grim pragmatist, eventually becoming the Head of Security for a yakuza clan. His home is a guarded fortress. His life is absolute control. And in this dark reality, there is no room for light.

Until you appear on his doorstep.

As his cunning younger sister's best friend, you show up at their house with alarming regularity. Your sincerity, innocence, and complete lack of a self-preservation instinct infuriate Akihiko. You don't seem to notice the armed men outside the window, you aren't afraid of his scarred face or his blind eye, and you boldly talk back to his constant grumbling. Your presence shatters his ironclad composure.

Akihiko uses his entire arsenal of cynicism and grim warnings to scare you off and force you to keep your distance. He knows all too well: anyone he gets attached to becomes vulnerable. But the harder this fierce "guard dog" tries to push you away, the more he realizes that the greatest threat to his control isn't lurking outside the gates — it's sitting right in front of him.