Here is a concise summary of the provided text:
**Protagonist Hitachi's Life Story**
* **Childhood**: Witnessed the horrors of the Great Third Ninja War at age 4, killing a wounded soldier in self-defense. Struggled with the meaning of life after the event.
* **Youth**: Entered the Ninja Academy, excelled, and became popular. Formed close relationships, including with a girl named Insume.
* **Tragedy**: Lost a friend (Tema) to an enemy (Tobey), leading to a quest for vengeance.
* **Coup & Mission**: Received a mission to annihilate his own clan, which he accepted, and carried out with the help of his friend's killer.
* **Love & Family**:
+ Met Insume again, and they started a romantic relationship.
+ Got married, had a child, and lived a happy life.
* **Legacy**: Their child grew up to attend the Ninja Academy, inheriting Hitachi's prodigious talent.
* **Old Age**: Hitachi's wife passed away in his arms, thanking him for their happy life, and he followed soon after, surrounded by memories of their life together.
Here are the extracted key facts in short sentences, numbered for reference:
**Early Life**
1. Hitachi was 4 years old during the Great Third Ninja War.
2. He witnessed the horrors of war, including thousands of fallen ninjas.
3. Hitachi killed a wounded man who attacked him in self-defense.
4. His father explained that war is between countries, not people.
**Childhood Events**
5. Hitachi's mother was pregnant with his brother during this time.
6. His brother was born in the summer and named after their father.
7. Hitachi met a girl named Insume from his clan, who offered to play with him.
8. He initially ignored her due to being lost in thought.
**Ninja Academy**
9. Hitachi entered the ninja academy, where he demonstrated prodigious skills.
10. He became popular among his peers, especially the girls.
11. He began leaving a clone in his place to train with his friend, Si Tui.
12. He was discovered and decided to advance his training to become a ninja.
**Personal Relationships and Missions**
13. Hitachi reunited with Insume, who apologized for not congratulating him on his graduation.
14. Insume offered Hitachi tangos, which revealed his fondness for sweets.
15. Hitachi's teammate, Tema, was murdered by Tobey during a mission.
16. Hitachi received a mission to annihilate his entire clan to protect the village.
17. He accepted the mission and requested help from Tobey, Tema's murderer.
**Family and Later Life**
18. Hitachi killed his parents as part of the mission, with their prior acceptance.
19. He met Insume again, and they began a romantic relationship.
20. Hitachi proposed to Insume with an engagement ring, and she accepted.
21. They got married, surrounded by loved ones, including their parents and friends.
22. Insume wore a classic white wedding kimono, and Hitachi wore a black kimono.
23. They had a child, a hyperactive boy who resembled Hitachi in appearance and talent.
24. Their son attended the ninja academy, making his parents proud.
25. In their final years, Hitachi's wife passed away in his arms, thanking him for her happiness.