I need a place to celebrate my birthday but i am stuck. Help…

I live in japan. And soon is my 20th birthday. And i wanted to make nice hangout with my friends. Around 8-10 people. Mostly students, one 2 is working. So we don’t have a big budget. And i don’t they would spend 10’000yen for someone else’s birthday.

What i was thinking is BBQ party near by tokyo. Max 2 hours away. But most of them are like too packed, might be overcrowded (esp on weekends). And only 5-6 hours. And to be honest i don’t know. I want my friends to feel good and free. Not paced within a time limit. Could you guys give me some recommendations. Like what i do or where should i go etc.

Additional context: it will early September. All want is food, some space to talk, play, maybe a sing. Just be free and have a great time. I checked almost 15 bbq park. And longest they can is 5pm. And i don’t clubbing or bar or stuff. Sorry for being picky. I would be grateful every respond. Thank a lot

by K_idiot123