Beginner question: Where's the yaku in this hand?

[Deshi]

It\'s the hand of the 2nd episode of Akagi (11:48 into the episode). Here\'s the hand:

3 man pair, 3-5 pin, 6-8 pin, 2 sou set + 3-5 sou pon (ron with 5 pin)

Now from my bloody beginner understanding this is not a closed hand any more. So pinfu is out. Where\'s the yaku here?

[Monadology]

Inside hand. No terminals or honors were present. In many rule sets, Inside hands are allowed to be open.

[Deshi]

I see. Thanks a lot. I see it now :)

I hope this kind of questions aren\'t too annoying.

[Barticle]

Hi Deshi, and welcome to the site!

I hope this kind of questions aren\'t too annoying.

We were all learners once. :)

This yaku is also known as Tanyao or All Simples.

The optional rule that allows it in an exposed hand is usually called Kuitan.