|I agree that the romance in this manga will be disappointing like Yanki-kun to Megane-chan. The story will probably revolve around comedy with little to no romance. That said, I still find the manga funny and enjoyable.
There are also some twists coming up (Spoilers for untranslated chapters)
Spoiler (mouse over to view)
Yamada kisses another girl and his power changes. Now, anyone he kisses, falls in love with him after 1 day. The power doesn't work on Shirashi though, so it looks like there will be 7 witches with different powers and when Yamada kisses them He gains different powers (He can store one power at a time though)
The manga will probably become one huge ass harem.