The first restaurant we tried to search for after moving in Osaka was a Thai Restaurant. We found Krungtep in Shinsaibashi. They have an eat-all you can buffet for 1200yen for 90 minutes. Lunch starts from 11:30 AM to 3:00 PM.
H and I both love spicy food , specially Thai Green Curry. So first activity of my summer holiday : Thai Eat All you can.