Guests
| “ | I will carefully determine what guests to invite and write an invitation accordingly, and you will entertain the guests once they accept the invitation and arrive at the Library. | ” |
Guests are the various groups and people invited to the Library via the Invitations, and the enemies of the game that are fought in receptions. The guests come from various backgrounds, including Syndicates and Offices. They are lured by the Books put into the Invitations, which are often of worth or use for them. By accepting the Invitation's conditions, Guests agree to the Library's deal: If they win their reception, they can take the Books they want and leave; if they lose, they will be turned into Books themselves.
There are unique guest characters who have set names and stories as well as generic guests who have only a title rather than a name. These guests are invited both through Red Invitations, which make up the guided main story path of Library Of Ruina, as well as the supplementary General Invitations which are not part of the main story tree. For more information on General Invitations, see the relevant page.
Red Invitations
Canard
| Name | Chapter | Episodes | Books used in the Invitation |
|---|---|---|---|
| Rats | Chapter 1 | 1 |  Book of Something
|
| Yun’s Office | Chapter 2 | 3 | Episode 1:  Book of RatsEpisode 2: |
| Brotherhood of Iron | Chapter 3 | 1 |  Book of Yun’s Office
|
| Hook Office | Chapter 4 | 1 |  Book of the Brotherhood of Iron
|
Urban Myth
| Name | Chapter | Episodes | Books used in the Invitation |
|---|---|---|---|
| Pierre’s Bistro | Chapter 1 | 1 |  Book of Taein
|
| Streetlight Office | Chapter 2 | 2 | Episode 1:  Book of Jack and Book of PierreEpisode 2: |
Urban Legend
| Name | Chapter | Episodes | Books used in the Invitation |
|---|---|---|---|
| Zwei Association | Chapter 1 | 3 | Episode 1:  Book of Lulu and Book of MarsEpisode 2: |
| Stray Dogs | Chapter 2.1 | 1 |  Book of Walter
|
| Molar Office | Chapter 2.2 | 1 | Book of Walter
|
Urban Plague
| Name | Chapter | Episodes | Books used in the Invitation |
|---|---|---|---|
| The Carnival | Chapter 1.1 | 1 |  Book of Gyeong-mi
|
| Full-Stop Office | Chapter 1.2 | 1 | Book of Zwei South Section 6
|
| Dawn Office | Chapter 1.3 | 1 | Book of Walter
|
| Gaze Office | Chapter 1.4 | 1 |  Book of Olga
|
| Kurokumo Clan | Chapter 2.1 | 1 |  Book of The Carnival
|
| Musicians of Bremen | Chapter 2.2 | 1 |  Book of Full-Stop Office
|
| Wedge Office | Chapter 2.3 | 1 |  Book of Salvador
|
| Love Town | Chapter 2.4 | 1 |  Book of Alloc
|
Urban Nightmare
| Name | Chapter | Episodes | Books used in the Invitation |
|---|---|---|---|
| Sweepers | Chapter 1.1 | 1 |  Book of Kurokumo Clan
|
| Shi Association | Chapter 1.2 | 1 | Book of Full-Stop Office
|
| The 8 o’Clock Circus | Chapter 1.3 | 1 |  Book of Oscar
|
| Puppets | Chapter 1.4 | 1 |  Book of Tomerry
|
| Index Proselytes | Chapter 2.1 | 1 |  Book of a Sweeper
|
| Smiling Faces | Chapter 2.2 | 1 |  Book of Yujin
|
| The Crying Children | Chapter 2.3 | 1 |  Book of Emma
|
| WARP Cleanup Crew | Chapter 2.4 | 1 |  Book of a Puppet
|
Star of the City
| Name | Chapter | Episodes | Books used in the Invitation |
|---|---|---|---|
| The Thumb | Chapter 1.1 | 2 | Episode 1:  Book of Index ProselytesEpisode 2: |
| The Blue Reverberation | Chapter 1.2 | 1 |  Book of the Smiling Faces
|
| Liu Association Section 2 | Chapter 1.3 | 2 | Episode 1:  Unstable Book of the Crying ChildrenEpisode 2: |
| Cane Office | Chapter 1.4 | 1 |  Book of WARP Cleanup Crew
|
| Index Proxies | Chapter 2.1 | 1 |  Book of the Thumb
|
| The Red Mist | Chapter 2.2 | 1 |  Book of Lobotomy Corporation
|
| Liu Association Section 1 | Chapter 2.3 | 1 |  Book of Mei
|
| R Corp. I | Chapter 2.4 | 1 | Book of WARP Cleanup Crew
|
| 얀샋ㄷ요무 | Chapter 3.1 | 1 | Book of Gloria
|
| The Purple Tear | Chapter 3.2 | 1 |  Book of the Red Mist
|
| Xiao | Chapter 3.3 | 1 | Book of Chun
|
| R Corp. Ⅱ | Chapter 3.4 | 1 |  Book of the Rabbit Team
|
Impuritas Civitatis
| Name | Chapter | Episodes | Books used in the Invitation |
|---|---|---|---|
| Hana Association | Chapter 1 | 2 | Episode 1:  Book of 얀샋ㄷ요무,  Book of Xiao and  Book of the Purple TearEpisode 2: |
| The Reverberation Ensemble | Chapter 2 | 1 | Uninvited Guests
Consists of 10 different Receptions, each received by a different Floor: |
| The Black Silence | Chapter 3 | 1 | Uninvited Guests |
| The Reverb Ensemble Distorted | Chapter 4 | N/A | Uninvited Guests (Complete the Realization of the Floor of General Works to access this fight) |
| The Final Reception | Chapter 5 | N/A | Uninvited Guests |
