upgrade 外:中央広場 until you get the NPC in front of the fountain in the greyish outfit, then put enough points into speed to preemptive strike on him and the rest into attack, with 炎 as the day of the week for double base attack, and just repeatedly kill him for gold and exp in one turn for a couple hours to get to max level; the more levels you are under your "cap", the less exp you get, so always put in all your stat points as you level up. If you've been collecting the etcs on the ground, you can get a double exp item from the little park zone where the blonde haired main girl, I guess the vice president of student council or whatever, is in, from an exchange NPC, but honestly you will hit level 99 cap before you even have 1% of the total gold you need so it's not worth it. For the H battles, always go on day 水 for like 25-30% end of turn HP regen, put enough damage in to kill them in 1 hit and the rest into HP (defense seems absolutely worthless in this game, and so does the magic stat unless you have stacks of 99 spells which I haven't even found a way to buy yet). Every girl has her own set of unique abilities, though one that is absolutely overused and an incredibly annoying timewaster is evasion+, so for certain fights just buy 99 of each of the items that have the effects 敏捷性を0にして命中率+100% and 防御力を0にして命中率+100% (another reason defense and speed are worthless as this sets them to 0) and pray the +200 accuracy will reduce each round to 10 turns of misses instead of 20, unless there's a 100% chance to hit item I haven't found yet.