Page or block to display items linked in submenu

A very similar question was already asked at http://drupal.stackexchange.com/questions/195947/page-to-show-submenu-items, but unfortunately was not answered, so maybe someone here has a good idea.

I have a menu with 3 levels:

Level 1 item A1
   Level 2 item M2
   Level 2 item F2
      Level 3 item S3
      Level 3 item P3
   Level 2 item X2
   Level 2 item H2
Level 1 item B1
   Level 2 item K2
   Level 2 item G2

When I click on a parent link a page should open with the teasers of the content linked in the direct children of the parent menu. So if I click for example on the A1 menu link a page opens with the teasers of M2, F2, X2 and H2, without S3 and P3. I know that his can be achieved with a Taxonomy, but this results in a list like F2, H2, M2 and X2, but I want it to be listed in the same order as it is linked in the menu.