There used to be a man who loved yukkuri very much. One day, he felt guilty for his inability to save a yukkuri (he can't swim). He then trained himself to be stronger.
At first, he go to Reimu and shows his affection (which doesn't end well), then throw away Reimu when he realized she's already a used stuff (married and has children).
He chased Marisa, run over water, etc. But in the end, he realized that he loves Marisa yukkuri, not Reimu, so he bring Marisa home.
This extra page, apparently he skipped work today to look for yukkuri. That's his mom on the phone asking why he hasn't came home yet.
Bumping, but wasn't anon a woman who became masculine through her rigorous training?
past anon was shown naked in the flashbacks and he had a teeny uncovered chest so he was probably just an effeminate man his body proportions are also nearer to a man than a woman