"Hikaru" in the Jomon world ３

A boy and his younger sister were swallowed by a whirlpool in time on the foot of Yatugatake and did a warp in the jyomon period that was 7000 years before.
His name is Hikaru who is 9 years old ,
" I feel sorry for my younger sister."
Her name is Sumire who was only 5 years old.
　　　　
　少年と妹は八ヶ岳の山麓で時間の渦に巻きこまれ、7000年前の縄文世界にワープしてしまったようです。
　少年の名前は「ヒカル」、９歳です、おかあさんはいません、
　「ぼくは男の子だから平気だけど妹がかわいそうだな」

　妹の名前は「スミレ」、まだ５歳です。