City: Open the Lid and Get a Prize

By chance, I won the 'Open the lid and get a prize' system; Just open the lid and there will be prizes you can't imagine. "Open the lid and win a prize. One more girl. The beauty will arrive at the scene within three minutes." "Open the lid and you'll get a prize. If you add another 100 million, you'll receive the message immediately." "Open the lid and win a prize. Get a wife, your own wife. You can set your own figure and appearance." "Open the lid and you'll get a prize. Let's play another song. You can choose whatever song you want." "Open the lid and you'll get a prize. One more skill. If you're missing any skills, just pick whatever you want." As long as you open the lid, you can win. A magical system gives you magical rewards. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.