[Freakman]

About the openers :

Spoiler for obviously, lots of game spoilers:

Spoiler for safety:

For Tatarigoroshi, how about the Satoko/Keiichi scene on the bridge ? (they just cut the scene as Keiichi starts falling).
The Keiichi/Teppei scene happens too early to make a good opener scene.
Well, there's also the option of showing the gas leak incident.

For Himatsubushi hmm... Rika's "yogen" scene perhaps.

For Meakashi, come to think of it, yes, the Satoko scene could be effective, but how about the scene where Mion/Shion pushes Mion/Shion into the "well" ?

And finally for Tsumihoroboshi... most likely an extract from the Keiichi/Rena fight. Seems the best option.