>>2958956>watermelonsDrop items to level and limit break swimsuits. Best paired with a trendy swimsuit for the week for massive bonuses.
Eventually you'll be drowning in upgrade materials for swimsuits so basic watermelons aren't as important, and instead you'll want to go for the special colored watermelons for more premium rewards
>EXP itemsSuch as clovers or a girl's favorite item. These items are fine but are also a sort of investment since on the ENG server a girl gets 1.5x exp on their birthday. So people end up hoarding clovers and shiny stones for a year waiting for their special day. As a new player you'll hit level 50 relatively easily, but after that is when the leveling becomes much slower.
>R level bromidesThe bromide leveling system is something you will not get much out of as a new player. Getting all "copies" of a bromide is cheap however so if you have extra currency then go for it.