Destiny Unchain Online: Kyuuketsuki Shoujo to Natte, Yagate 'Aka no Maou' to Yobareru You ni Narimashita - Vol. 2 Ch. 10 - Secret Sword「 Kokonoe 」

[MangaDex]

 

[RougeGrail]

She better cook Oni before elf sis cook Oni herself

 

[pandascepter]

How does he know that itll be 9 more slashes, hes just that good at video gaming.

 

[nyaasar]

How does he know that itll be 9 more slashes, hes just that good at video gaming.

It's those circles behind Ma-Tou in page 7, and "kokonoe" literally means ninefolds.

Also, those chants: Rin, pyou, tou, etc. are from the famous Nine Hand Seals.
https://en.wikipedia.org/wiki/Kuji-in