The summary is:
Kirito and Asuna investigate a series of mysterious deaths in a guild, and discover that the guild leader Grimlock killed his wife Griselda and hired Laughing Coffin to kill the other members who voted to keep a rare item. Kirito and Asuna expose Grimlock's crime and save the remaining members, but are haunted by Griselda's ghost. Kirito also mocks Schmitt, a cowardly reviewer, and reopens his foundation of being always right.
Here are some possible facts extracted from the text:
1. Yolko was stabbed and killed by a mysterious assailant.
2. Kirito chased after the suspect but lost them when they used a teleport crystal.
3. Schmitt was terrified and believed that Griselda's ghost was coming for him.
4. Kirito and Asuna found out that Yolko and Kains faked their deaths using a glitch on Floor 57.
5. Kirito deduced that Grimlock was the real killer of Griselda, his wife and the leader of the Golden Apple guild.
6. Grimlock killed Griselda because he felt she changed and betrayed him by not making him dinner.
7. Kirito and Asuna confronted Grimlock with the help of Laughing Coffin, a group of hired killers.
8. Yolko, Kains, and Schmitt beat up Grimlock behind a tree and broke his neck.
9. Griselda's ghost appeared and thanked Kirito and Asuna for freeing her soul.
10. Kirito celebrated his victory by reopening his "Kirito is Always Right Foundation".