<p>Per the <a href="http://www.naruto.wikia.com/wiki/Shisui_Uchiha" rel="nofollow">wiki</a>: "At the end of the Third Shinobi World War Shisui witnessed his best friend die without being able to do anything to save him, consequently awakening the Mangekyo Sharingan"  The reference is "Itachi Shinden: Book of Dark Night" (which I skipped).</p>

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2016-10-18T14:02:56.310Z
2016-10-18T14:02:56.310Z
kaine
<p>We know that to awaken Mangekyou Sharingan the wielder must witness the death of someone close to them like Itachi with Shisui's death,
Obito and Kakashi with Rin's, and Sasuke with Itachi's.</p>

<p>So whose death did Shisui see?</p>

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2016-10-18T08:12:45.220Z
IIRC it was his girlfriend.
絢瀬絵里
CC BY-SA 3.0
2016-10-18T14:03:36.560Z
Wikia states it was the death of a close rival. Probably wrong though since I can't find anything corroborating that. I However think it was the death of his family when he and Itachi were both kids.
Arcane
<naruto>
How did Shisui awakened his Mangekyo Sharingan?
# How did Shisui awakened his Mangekyo Sharingan?
Posted by: username_0 on 2016-10-18
We know that to awaken Mangekyou Sharingan the wielder must witness the death of someone close to them like Itachi with Shisui's death,
Obito and Kakashi with Rin's, and Sasuke with Itachi's.

So whose death did Shisui see?
**Tags:** naruto
> **Comments:**
> **username_1**: IIRC it was his girlfriend.  
> **username_2**: Wikia states it was the death of a close rival. Probably wrong though since I can't find anything corroborating that. I However think it was the death of his family when he and Itachi were both kids.  
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## 1 answers
### Answer by username_3 on 2016-10-18. Score: 2 | Accepted answer
Per the [wiki](http://www.naruto.wikia.com/wiki/Shisui_Uchiha): "At the end of the Third Shinobi World War Shisui witnessed his best friend die without being able to do anything to save him, consequently awakening the Mangekyo Sharingan" The reference is "Itachi Shinden: Book of Dark Night" (which I skipped).
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