Kai's hyper is Protagonist's Privilege. When activated, Protagonist's Privilege makes it so that when the unit playing the card initiates a battle, the opposing unit cannot attack. This effect lasts for 3 chapters.
Protagonist's Privilege is an unusual hyper in that it has no blatant damaging or protective effect on its own, relying solely on combat to activate it. While not particularly powerful on its own, the main advantage of Protagonist's Privilege is that it enables the player to take risks and remain safe while doing so, as long as they strike first. For example, the player will be able to enter abattle with 1 HP and leaving unharmed, as the boss will not get to attack. This method of shielding against the boss is a very common use for the hyper and is advisable in multiple scenarios. Or in another situation, if the player is pursuing a low health opponent, they can keep attacking the opponent until they are KO'd without the chance of being KO'd themselves. To get the best results out of the hyper, the player should generally activate later in the game to help them defeat the boss or weakened opponents, and then possibly pair it with a battle card. Using while the hyper is active will let Kai get a free attack roll against a defending opponent before the combat phase acts as normal and can be used to strike the opponent hard. More specialized plays are possible as well, such as using without the risk of retaliation damage after stealing the opponent's stars. Best of all, the player will have 3 chapters to deal as much damage as they can and catch up to far opponents if needed. Overall, the card gives the player a lot of choices, for what they want to accomplish with the card.
Despite its advantages, Protagonist's Privilege is a flawed card, however. Firstly, the hyper is not cheap at a cost of 20 stars, and using powerful combos to bring the card to the maximum potential will often cost the player around 50 stars. Thus, using Boss. The second and most blatant issue with the card is that unlike other hypers, it does not do anything, as in it does not deal damage or steal stars on its own. If the player wants to take advantage of the hyper, they can only do so through the course of raw combat, not a "super card" that automatically does the heavy lifting for them. Lastly, the most obvious weakness is that Kai must attack first to get the benefit from the effect. As a result, the hyper lacks usefulness when all opponents are behind Kai and leaves a massive window open for the opponents to assault the player even when the hyper is active.is beneficial in lowering the cost but will result in the player using their entire hand to make a combo, leaving them vulnerable if an opponent approaches, especially in the late game. Thus, it may be in the player's best interest to mainly use the card for the