I don't have a direct link to it because I've just had it in my Totally Not Hentai Games folder for ages, but I'd recommend just Googling an RPG Maker MV cheat tool. I'm pretty sure I got the one I have from F95 somewhere, so it's probably here if you do a little digging.
Basically, it inserts a couple files into any RPG Maker MV game (usually ones that include a 'www' folder) that allow you to edit game values on the fly. There's a bit of a learning curve -- especially if you're an idiot like me -- but it works for more or less every RPG Maker MV-based game. Very handy to keep around.
Failing that, you can use an online save editor like saveditonline.com to... well, edit your save file (Also tends to work with Renpy games), but I find that slightly less helpful in cases like Summer/Winter Memories because your values are always fluctuating all over the place so being able to just, say, restore your stamina or whatever while playing is very helpful.
Good luck!
EDIT: I felt bad for not providing a link, so I found it here on F95 after all
https://f95zone.to/threads/rpg-maker-mv-mz-cheat-ui-plugin.114882/