As for how I became aware of this life-changing game (OK, so that may be laying it on a bit thick): Frankly, I found out about it while perusing one of my favorite websites, Kimimi's Blog.

Late last year, Kimimi published a rather glowing write-up of this Kappa Games-developed title. In particular, this line stuck out at me: "Your small ninja is tasked with making sure precious love hearts find their way across the screen and soften the hearts of the people on the other side." Cute, right?
Just as cute--and just as important in terms of piquing my interest in both Flash Koibitokun in particular and the WonderSwan in general--are the colorful screenshots Kimimi posted of this portable puzzler.

Sadly, I can't yet share any impressions of this acquisition since, well, I still don't have a WonderSwan (or, rather, a SwanCrystal) system. Hey, don't look at me like that. I'll get one soon. Or eventually. I promise.
For the time being, though, I'll just continue to stare at the boxes and flip through the manuals of the handful of WonderSwan I've bought thus far.
See also: Previous 'Acquisition #123' posts