Totally agree with what was mentioned above.
If you want a better chance at snagging an upgrade, you should fly Kobe UKB-HND or Kansai KIX-HND. If are you are in Central Osaka, going to ITM vs. UKB isn't that far off, maybe 20 minutes more or so for UKB. On the flipside, going to KIX is a bit of a nuisance unless you're in Southern Osaka or are in proximity of Kyoto or Shin-Osaka Sta., in which case you could book a Haruka Ltd. Express to KIX - though probably not worth the effort just to upgrade a 55 mins flight!