What bugged me most about Seikrei is how the main character gets all these magical girlfriends dumped in his lap (and trying to climb into his futon), is obviously supposed to take care and provide for them in exchange for their protection and support in the "game," but never even tries to make any sort of money with them, even though that seems to clearly be the expectation of the whole game, and even the "sleazebag loser" Seo at least tries to employ his seikrei to this end. I can even instantly think of a way Sahashi could make a killing in an industry that Japan has always been unable to make significant strides: lumber.  

- Kusano grows rare, exotic trees from seeds

- Musubi acts as a lumberjack, chopping the trees down (or doing the "punch tree, get wood" Minecraft trick) and carrying them to the warehouse/mill

- Matsu acquires a cheap log chopper off eBay (the largest material outlay) and keeps it running, rendering the logs Musubi loads into green cuts of wood

- Tsukumi, Kazehana, and Homura use their powers together to dry and season the lumber as fast as commercial lumber yards do, if not faster

- Sahashi uses his contacts in the construction industry to sell the lumber, undercutting all competitors and possibly even the price of traditional bamboo/paper

Not sure why this never actually happened, but it could have been awesome even in combination with the rest of the story, and made Sahashi look like far less of a loser.