K-21P

A Robot-type enemy and the strongest of the K-series robots, this creature, despite not being as strong as the S-series robots, it's still a veritable menace itself, as its the kind of minion that Harvestasha continually summons during the battle against her. These robots have enhanced stats, but still keep the same properties as the previously seen K-01 and K-11G, which given the situation in which they appear, could be quite dangerous due to them being able to reduce your Defense so Harvestasha can then kill you more easily. However, you shouldn't pay much attention to them and just focus on Harvestasha, as she can easily summon more of these robots whenever you kill the ones that were already present.

Trivia
Despite having a programmed drop list and set amounts of Leaf and Experience, since this monster only appears as a minion summoned by a boss, you won't be taken to the Battle Results screen after you win, so it's impossible to gain anything from its drop list.