Kiri

{| border="0" cellpadding="1" cellspacing="1" class="article-table" style="width: 660px;" The soul of Date Masamune's treasured sword. Masamune was famous for chopping a candlestick whenever he executed one of his vassals.

How to acquire
Collect all six seal stones in Chapter 9 to unseal Kiri. Also if you collect them again you will obtain Kiri Magatama.

It is best to fuse with Kotetsu to increase the skill level, who has the same type of skill as Kiri.