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That's the 2 gate pieces and 80 normal wood.

maybe you should have a look at your objective.There are some tips such as talk with Hana or Yui

Get the 2 gate pieces from Yui, then chop 80 wood

First you gotta get the gate that is on the left side of the destroyed wall when you head to The Doctor's house (I forgot her name just now I am sorry if I have sinned), then you get a cutscene where you are roided up, and bring the two doors to Mayu's house, then you just collect the necessary amount of wood and a cutscene where Yui says that her and her team will do it. Hope it helps