|The opening of the 'Falling Leaf' kata: Rakuyo. It is the third in a series of kata, which includes Hachimon and Senka.|
The following 'KOTEN-GATA' list is what I have been following the last seven years, since 2010. I will not go into oyo (application) publicly but what I teach -- from Asai Sensei -- is a very unique system, which is organizationally in-house, and strongly connects with Okinawa and China.
27. Suishu (Mizu no te)
The rationale behind practising these additional kata is "karate as effective martial arts". Learning new kata for 'kata sake' (pun for non-Japanese readers intended) has no meaning. These additional kata are for kumite/self-defence training 'specific for individuals'. In this regard, to individualistic specificity, they are very useful for developing high level 'Martial Art Karate' skills.