You must go to extras on the main menu, then go to Cheats, then enter BIGBOI.

Unlockable: Comp by Comp
You must go to extras on the main menu, then go to Cheats, then enter CHOCOCITY.

Unlockable: Dragon House by Chiang
You must go to extras on the main menu, then go to Cheats, then enter AKIRA.

Unlockable: Get it Now by Bless
You must go to extras on the main menu, then go to Cheats, then enter PLATINUMB.

Unlockable: Koto by Chiang
You must go to extras on the main menu, then go to Cheats, then enter GHOSTSHELL.

Fight as a girl in story mode:
Right when you start playing story mode, only fight in the bars like 7th heaven and the limit where a lot of girls are. After the first fight where a guy is taking up for a girl and you win, the girl should message you and say something sexy. go to a bar a few more times and another girl will start flirting with you. When she does, your first girl will get mad and start yelling at her. Then you will fight the first girl as the second girl. whoever wins sends you another message. then the only way you ever talk to them again is if you get another girl.

Unlockable: Get it Now by Bless
You must go to extras on the main menu, then go to Cheats, then enter PLATINUMB.

Unlockable: Koto by Chiang
You must go to extras on the main menu, then go to Cheats, then enter GHOSTSHELL.