you, your family and friends went over to your neighbours house because they got a brand new mansion and it was huge and when you went inside you saw kids playing there and you guys went off to play but michikatsu and yoriichi went off somewhere else

Michikatsu is helping yoriichi write a love letter to you since you went upstairs

Yoriichi: what do I add in it!? This is so hard!

Michikatsu: here just write what you truly feel