"Him" is either the persistent guy or Zai the retainer, as both are kinda Chekov's gun'd into the story but I doubt Zai would be the guy who kept hitting on Riri (I got the vibe that he was even trying to get those two together)
Anyway I really like how retrospective Ooma is. She's also...
Ah wait, is this why it's called "Dungeon Renovation"? Is the next step of the story will be literally about renovating the Dungeon so it can become a popular adventuring spot once again?
I know this is an adaptation so there's already an answer to this but just putting my thoughts out here.
The full context here is that Marisa is becoming a youkai magician, it's a big no no in Gensokyo because it disrupts Gensokyo's status quo and stuff and one of Hakurei shrine maiden's big job is preventing humans from becoming a youkai (unnaturally)