To get the hard mode on Space Ring Fighter: On the title screen (of Space Ring Fighter) put the highlight Start and press: Up, Up, Down, Down, Left, Right, Left Right, X, O, and Miyuki will yell something and the game will start (O is the confirm button). The game will now be A LOT harder since every enemy you kill will shoot 3 bullets at you and the end boss is different and a lot harder. I found this trick after I took Miyuki to the Computer Club for the school fair during the 2nd year then finished the game with Miyuki. This mode is the same mode that Miyuki plays.