Managed to book a ticket from Jakarta to Houston and back from JFK to Jakarta, including 5 days in Tokyo during Cherry Blossom season. HND-JFK-HND is in First/The Suite. From JFK to Houston in Y, but I'll manage that...

All this for 310 euros each.
Thank you
OswegoYeung!
Btw, I am not able to change my ticket online because it's a multicity ticket. So I have to call ANA later if I want to.