2.5th Anniversary - Operation Welcome to Sekai!! ([2.5周年記念]セカイへようこそ大作戦！！) is a special campaign running from March 30, 2023 12:00 JST to April 20, 2023 23:59 JST. This special campaign was launched as a part of Project SEKAI's 2.5th Anniversary to invite friends to come play Project SEKAI.
Campaign details
Participating in the campaign depends on whether the player is new or not. For existing players, they will need share their invite codes to newly created accounts (the new players). The new players will enter these codes in game. Each mission completed rewards the new player with different items. Once all 3 are completed, the referring player will also receive rewards.
| Players Invited | Reward |
|---|---|
| 1 | [[File:|64px|link=|]]
|
| 2-10 |  ×50 |
| Mission | Reward |
|---|---|
| 1 unit main story read | ×300 |
| 2 unit main stories read |  ×300 |
| 3 unit main stories read | [[File:|64px|link=|]]
|
Main stories are considered "read" once all chapters are complete and every chapter is read without using skip or fast forward. However, auto still counts as reading the chapter.
Existing players
For existing players, they can find their invite code by clicking on a banner with Miku waving in the home screen. This will bring up the page with the invite code, as well as the number of new players recruited.
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Banner location
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Existing player campaign page
New players
For new players, they can find the place to put the invite code they've received by clicking on the same banner with Miku waving.
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Banner location
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New player campaign page
Since using autoplay counts as reading, the table below is the approximate time taken to read each unit's story with auto.
| Unit | Read Time |
|---|---|
| Leo/need | 2 hours, 11 minutes |
| MORE MORE JUMP! | 2 hours, 30 minutes |
| Vivid BAD SQUAD | 2 hours, 21 minutes |
| Wonderlands×Showtime | 2 hours, 28 minutes |
| 25-ji, Nightcord de. | 2 hours, 19 minutes |