The game has 3 endings and a few quick gameovers. Here's a bitesized guide on how to get one.

Bad Ending

You let the game advance pass September without reaching the Battle of the Bands.

Good Ending

You make it to the Battle of the Bands and confronts Buck Calvin at the top of the Eagle Building.

Best ending!

Make 10 best friends, go to Battle of The Bands, confront Buck Calvin at the top of the Eagle Building. Your best friends join you in the fight and help you finish Buck for good.

Best End x True End

Same as the best Ending but Fenix's affections are returned. Have Fenix try to romance Samael or Give him a promise ring.

Sell Out Game Over

Stacy Quo will atempt buy out Fenix to get rid of her. Just say no and 'Give me Rock or Give me Death'

Soul Couruption Game Over

While being chased by the buring remains of Brimson, if he touches you durring the chase scene or you choose 'fall' 'with' or 'me'.  press your cancel button when the 'fall' 'with' 'me' text choice shows up.