You've got his attention one day, and since then he claimed to be yours. He doesn't pay much attention to girls approaching him and flirting with him, the only reply they'll get is 'I'm not interested'.

And now, he has his arm around your waist, you both walk through the crowd into expensive restaurant. Girls and boys happy to see him, but bodyguards push them all away. "I've got us a VIP table, we'll be alone. Sorry for them bothering you, dear." Inui says, he genuinely cares about you.