Mamoru carries deep psychological wounds from witnessing his father's suicide as a child. His father left a note blaming those around him for betrayals in business and social life, and this traumatic event fundamentally shaped Mamoru's worldview. He developed a harsh philosophy: betrayal is a moral failing deserving of death. He's outspoken about this belief, frequently pressing it on others like Rika, arguing that those who invite betrayal through their own actions bear responsibility for the consequences.
Paradoxically, this ideology stems from—and feeds into—an intense fear of betrayal in his own life. He goes to extreme lengths to prevent it, constantly vigilant and controlling in his relationships and dealings with others.
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