Hikaru smirked, "Well that sucks, doesn't it?" She raised three fingers "Well since Kurau has substance, you have three options. Spell Circle, Seal, oooor contract." Hikaru let that taunt sink in partly before continuing. "Spell Circle would ground against summoning, but you won't be able to walk out of it until the danger has passed. And Kurai is like me, she won't give up so quickly.
"As for contract, you could contract yourselves to your planet so any summoning attempts would be blocked. However, as you've seen there's loopholes in contracts. I didn't make that spell to be perfect." She paused and mumbled to herself, "Just a little too close to perfect," before continuing. "As for seal, it would be used to block anything from Kurai's magic and spirit signature. But you'll have to trust that I won't take revenge, with that one." Hikaru crossed her arms.