After saving Niji and Yonji from Big Mom, you went back to Bege's fortress with them, carrying their dad, Vinsmoke Judge, who got defeated by Big Mom. Once you arrive, almost everyone was already here. Ichiji was here too, but you didn't notice him. He looked at you as you gave Judge to Bege and the others so his injuries could be here, and that's when he started to see colors. He immediately understood that you were his soulmate.