Board Thread:General Discussion/@comment-203.28.248.35-20170508122443/@comment-31196269-20170508131355

My guess is that it was based on the swords list below our battle record. There's a number for each of the toudans if you notice. Based on your toudans :

Ishipapa 3, Iwatooshi 7, Ichi-nii 25, Honebami 29, Uguisumaru 55, Kashuu 85, Ookurikara 116, Shishiou 122