Play as Yuki in the first fight of the Marina level. When you press Down + Y during the fight to use the chainsaw uppercut against an enemy a cat's face will appear (similar to the 'Toasty!' appearance in Mortal Kombat). While the cat is visible press 'Start' and you will be teleported to a triple Boss fight. Defeat the bosses and you will get a present containing the Achievable Bead. This bead is needed to get the Bleep Bloop Achievement.