Long story short, submarines can be divided into these three types

based on cruising range.

This is for us Junsen type submarines' lineage.

Type-B

A's were flagships and aircraft-carrying subs.

B's were focused on reconnaissance or carrying aircraft.

C's focused on dealing damage.

Type-A

Type-B

Type-C

There was also a Type-D, in a completely separate lineage, specially designed for amphibious landing operations.

Type-D

T-That's enough.

On top of all those upgrades like Type-A Kai and Kai Ni, Type-B Kai and Kai Ni, Type-C Kai, and Type-D Kai, there were separate lineages focused on speed, like the Kaidai types - which went all the way up to Type KD7 - and medium and smaller lineages. Completely distinct lineages included transport and tanker submarines, small transport submarines, Sentaka type, Sentaka-Shō type-

-while they were based on the Junsen types like Type-A, Type-B, and Type-C, the high speed submarines were modern ships that brought to bear additional speed-

But the way you keep calling them Type-XX makes it sound like they all got special skills - that's cool!

Kiyoshimo will become a specialized destroyer!

What do you mean, a specialty.

Sometimes, as time passes, one's roles also change or grow.

Ah, Tatsuta-san!

Your Kai Ni is cool!