Irb has been born 20 years now.. To commemorate it I will talk about Reish and the next generation of Irb. Reish is an an unix shell for rubyist. It is a shell language that realize Ruby's feature. Also, it is an language which is metamorphosed from Ruby for more natural shell operation. Reish is under development. Reish is similar to Irb in usage, and various knowledge was gained in its development. I will introduce the vision of Irb next generation based on that.