This is a bright pink verging on purple ink of the Pilot Iroshizuku series. Tsutsuji is named after the Azalea flowers. Its red/pink hue is similar to the common red colour found among the Azalea flowers. As with all other Iroshizuku ink that I have used, Tsutsuji is a well behaved ink. It has very minimal shading on the stub nib but almost none on the fine nib. This ink just pops right off the paper and I love it.
I didn't have any ink in my collection similar to Pilot Iroshizuku Tsutsuji though so that's missing from the written review.