True Rationality Learned from Deluha: The Logic of Rationality That Incorporates Even Emotional Theory

—The Decisive Difference Between 'Those Who Discard Emotions' and 'Those Who Design Emotions'

'Emotions are irrational. Discard them and think'—this is often heard, but that is 'half-baked rationality.'
Deluha, the protagonist of 'This Communication,' is different. He reads emotions as variables, positions them, and turns them into results. That is why he is feared as 'Ethics 0: Rationality 100, the commander called a devil.'

1 | The Limits of 'Those Who Discard Emotions'

Thinking that tries to exclude emotions usually falls into the fallacy of 'not seeing part of the information.'
Fear, expectation, the desire for belonging, shame—these emotions are 'environmental variables' that directly affect human decision-making costs and reaction speeds. The more you discard them, the more misreadings increase, and in the real world, consensus building and operations collapse.

2 | Deluha 'Designs Emotions'

The official introduction is intense from the start.

In his world, life forms that corner humanity Iperit scatter toxic gas, and humans survive on high ground. The research institute created 'Huntress,' girl soldiers who regenerate even if they die—though with the specification that 'memories of a certain period just before death are lost.' Deluha incorporates that specification into his tactics.

Specifics: Redesigning by Utilizing Memory Loss

Huntresses 'return to one hour ago when they die = lose the memory of that time.' Therefore, Deluha kills them if an inconvenient event occurs, erases their memory, and resets the formation. In the early stages, to resolve infighting all at once, he intentionally kills Yomi with an axe, making the breakdown of the relationship itself 'never have happened' and starting over. By extinguishing the ignition point of emotions, he aims to optimize the team; it is a thorough move.

3 | 'True Rationality' Seen Through Contrast

A. Those who discard:

• Even though the goal is correct, they do not see the reasons why people do not move (anxiety, shame, desire for belonging)

• 'Correctness' is pushed through with volume → backlash amplifies → operations die

B. Deluha:

• He decides what to convey, what to hide, and in what order to place it (= staging of information)

• 'Painful information' is revealed later as a set with an alternative, giving a sense of controllability

• Turning even the rules (regeneration, memory loss, time constraints) into resources, and making decisions based on expected value

• At times, maintaining the optimal psychological temperature of the squad with a single turn of phrase, aiming for maximum results with minimum sacrifice

The core of this "staging" is consistently depicted throughout the work.Hiding the objective and utilizing even misunderstandings to move the situation—the "communication" in the title is not about conversation, but rather "designing the opponent's cognition" itself.

4 | Words that weaponize emotion

Deruha goes for maximum effect with minimal dialogue. The official PV symbolically portrays his character like this.

Eating, living—because he focuses on the minimum of desire, his "objective function" does not waver even with ruthless methods. That is why he is strong. On the other hand, he aims to drop
words that serve as reassurance to the Huntresses. He even manages who says the "effective" words like "I'm glad you're here" / what is placed in exchange for them (*also discussed among readers as symbolic phrase usage in the work)

5 | The intersection of ethics and rationality (short review including spoilers)

• Using bad moves for a good result—Deruha does this thoroughly. He does not even hesitate to massacre and reset the Huntresses. However, it is also realistically depicted that this “improves” the squad's coordination and relationships. The fact that the victory of rationality and the erosion of ethics proceed simultaneously is the brilliance of this work.

• That is why he is not a hero, but a "monster of operations". The label of devil is not just for show.

6 | Conclusion: Rationality includes emotion

“Discarding emotion” is not rationality. Reading, positioning, and turning emotions into results is rationality. Deruha,

• defines the objective (survival = eating) to the minimum, and

• Specifications (regeneration/memory loss) are turned into resources, and

• Words are used to influence the probability of human behavior.

What lies beyond that is the coldness indicated by the copy Ethics 0: Rationality 100, and an overwhelming sense of pleasure as a piece of literature.