Hitomi no Rakuin 3 ~Soubou no Sennou Choukyou~

Reihou Academy.
Until a few years ago, it was a prestigious all-girls school, the kind you’d call a "young ladies’ academy." But now, it’s co-ed.
Even so, the majority of students are still girls.

The protagonist, Sakurami Souya (first and last name changeable), enrolled in this school for one simple reason: it was close to home.
Despite the school’s high standards, he managed to pass the rigorous entrance exam for one of its ten scholarship spots.

Souya had a unique ability—one he’d discovered a few years ago. He could share the vision of anyone within his line of sight.
He called this ability "Seize." Over time, through experimentation and practice, he refined it, even learning to share and manipulate the memories of his targets.

But there was one miscalculation in his plans: Miyakouji Shizuha, a charismatic classmate who wielded significant influence in the school.
Shizuha and Souya had once been lovers. Since their breakup, she hadn’t bothered to hide her hostility toward him.
Still, thanks to his natural charm and top-tier grades, he managed to avoid any real trouble and lived his days in relative peace.

The following year, Souya’s younger sister, Sakurami Rumiho, followed in his footsteps and enrolled as a scholarship student.
The siblings, known for their close bond and academic excellence, quickly gained a reputation within the school.
Shizuha, unsurprisingly, wasn’t pleased.

Knowing she couldn’t take Souya down directly, Shizuha decided to use Rumiho as a pawn.
One day, Souya was lured to the rooftop using Rumiho’s name. It was a trap.
In the chaos, he fell from the roof.

When he woke up, he was in a hospital bed.
His life wasn’t in danger, but the injuries were severe enough to keep him hospitalized.

The accident left his abilities weakened.
What he could do now was far more limited than before.
Still, through experience Souya was confident he could regain his powers. In the meantime, he began plotting his revenge.

He soon learned that Shizuha, the one responsible for his injuries, had faced no consequences.
Thanks to her family’s wealth and the influence of the school principal, Morinaga Kanako, she’d gotten off scot-free.
As expected, Shizuha acted as if nothing had happened. Souya’s anger simmered quietly.

Rumiho seemed unharmed for now, but there was no guarantee that would last.
If that was the case…

"Then I’ll just take everything from them."

[Translated from dlsite]