Took me an hour to buy and upgrade everything and left with just below 200M to use for superchat, after that everything is really easy.
Tips on how to play:
1. Stock price is fixed, just look at the percentage of top 3 expensive stocks, save the game, go do other thing and check every 1 min, see the percentage difference of the top 3 expensive stock, if it's more than let's say +30%, load the game and all in BUY on that stock and "complete" the order at +30% or higher. BUY is the left button, SELL is the right button. The more money you put in, the higher the profit , so just all in every time until you reach certain amount you satisfied with, for me it's 200M. You can achieve this is Day 1. (I wish stock market is this volatile and easy...)
2. Fastest way to plant malware is, to go to their channel put 10M superchat on the bad comment(no 4 option, not sure about no 5, too evil for me to try lol), and then put 30M on good comment (no 1 or 2), their "affection" basically max, and you can plant any malware on her. This is especially useful for Mimosa the purple girl.
3. For lead, put 100k donation(you are rich anyway) and pick the good option, she will talk about something, and you have to pick the right answer between 3 options, there's sound cue if you answer correctly, and some will lead to next "question". The lead is obtained if you hear the cheering sound cue, so just save scum.
4. Hacking shouldn't be a problem after you upgrade everything, I recommend the Coin (no 4) malware, you can just skip buying the other 3. Gameplay is simple, it's like Potion Maker, pick the movement toward your target, the yellow folder (her secrets and basic information). If there is blue wall nearby, use the red circle thing in Special tab to destroy.
5. Each girl have 2 endings, 1 is the 4th hacking option if you obtain enough secrets about her and insert her at least once. Another is to lead her to lewd state and insert once, and wait till Day 20. (Normal state>5 times interactions(any)>Desperation state>5 times interactions(any)>Lewd state). If you are trying to open all CG, make sure to save first and explore all before moving to the next state.
Overall the gameplay is really simple, the CGs is kinda eh... that is to be expected from Beelzebub games, BUT the characters and plots are really interesting as always Beelzebub.