Inoue, Inoue's father, and others Murdered by Endo Ki, Chuo City, Yamanashi, Japan
This source-based behavioral analysis does not establish a clinical diagnosis, motive, or legal finding.
This case involves a juvenile offender whose obsessive one-sided love and social withdrawal escalated into violent domestic homicide and arson. Behavioral changes, family disruption, and rejection contributed to a pathway of escalating violence.
Endo Ki developed an obsessive attachment to Inoue, which was unreciprocated. His social isolation, mental instability, and family background, including parental criminality and overprotective mother, contributed to maladaptive coping and stalking behaviors. Rejection by Inoue triggered delusional beliefs of betrayal and revenge motives.
The pathway progressed from early behavioral oddities and family disruption, through obsessive pursuit and stalking, to planning and executing a violent attack, culminating in arson and murder.
Each entry separates the reported behavior or state from the analytical strength of the available narration.
| Behavior / construct | Person / subject | Detailed case context | Evidence |
|---|---|---|---|
| Social isolation Relationship stressor | Endo Ki OffenderLover of victim |
Endo exhibited social withdrawal, preferring solitary activities and limited peer interaction, indicating social isolation during formative years. Context or trigger: After reprimand in junior high and family disruption Reported expression: Playing games alone, limited peer communication, talking more with teachers |
Narrative-supported psychological state Confidence: High |
| Jealousy Emotional state | Endo Ki OffenderLover of victim |
Endo's inability to accept rejection led to jealousy manifesting as stalking and intrusive behaviors toward Inoue. Context or trigger: Rejection and blocking by Inoue Reported expression: Delusion of betrayal, stalking, sending unwanted gifts |
Explicitly reported Confidence: High |
| Maladaptive coping Coping response | Endo Ki OffenderLover of victim |
Endo's response to rejection was maladaptive, escalating to violent planning and execution of murder and arson. Context or trigger: Failed romantic pursuit and social rejection Reported expression: Planning and committing violent arson-murder |
Explicitly reported Confidence: High |
| Family opposition or interference Family dynamics | Endo Ki OffenderLover of victim |
Endo's family background included parental criminal behavior and divorce, possibly contributing to emotional instability. Context or trigger: Parental divorce and father's criminality Reported expression: Potential emotional impact and family disruption |
Narrative-supported psychological state Confidence: Moderate |
| Emotional escalation Escalation | Endo Ki OffenderLover of victim |
Endo's emotional state escalated from obsession to violent thoughts culminating in the attack. Context or trigger: Rejection and stalking escalation Reported expression: Increasing obsession and violent ideation |
Analytical inference Confidence: High |
Select a stage to expand it; scroll horizontally to follow the full sequence.
Endo showed social withdrawal and odd behaviors during junior high and early high school, including solitary gaming and limited peer interaction.
Parental criminality and divorce disrupted Endo's family environment, with an overprotective mother influencing his behavior.
Endo developed obsessive feelings for Inoue, altering his social activities to get closer to her.
After rejection and blocking by Inoue, Endo began stalking and sending unwanted gifts, fueled by jealousy and delusional beliefs.
Endo planned a violent attack involving stabbing and arson as a maladaptive response to rejection and emotional distress.
Endo carried out the attack, killing Inoue's parents, injuring her sister, and setting the house on fire, reflecting peak emotional escalation.
After fleeing, Endo voluntarily surrendered to police, crying and confessing to the crime.
Arrows show the sequence described in the source narrative; they do not prove that one psychological state caused the next event.
Analysis is limited by lack of clinical diagnosis, incomplete details on mental health, and absence of direct psychological evaluations. Some behavioral inferences are based on narrative reports.