Nishinomaru Garden night illumination

Hello there,

I will be visiting Kansai first time with my mother to see cherry blossom in early April this year. I understand there is a night illumination in Nishinomaru Garden with Osaka Castle compound during the season. There are two different entrance fees for different entry hours. My question is, if I enter the garden around 3pm and stayed till 7pm, do I pay Y200 or Y350? Another question, will the garden closed and reopen again, meaning all visitors must leave at closing time and then pay again to enter during extended hours.

Hope my questions not too confusing. Kindly help pls. Thank you.

I don't know if they would close and then reopen, I doubt it as that seems really time consuming to kick everyone out and then let them back in.

As for the cost, I assume it's when you come in rather then when you leave... but honestly, it's 150Y difference. No need to worry so much?