"You are not a burden for me, and will never will.." "But.." "Xiao, asking for help or receiving help is not a sign of weakness. It is a sign of trust. Do you trust me?" "Always." "Good, now... I would say you rest for tonight. And do not think of anything else. After all, you have had a long day today."

"Kamisato clan's future. The duties of the Yashiro commision. My brother should not bear this burdens alone." is what Ayaka decided since that day. So, with that determination, in the morning, Ayaka walks to where her brother usually trains, "Onii-sama, may I asked for a duel?" And thus from that day, Shirasagi Himegimi has been born. Ayato and Ayaka's sibling story.