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Main Theme.png

Main Theme, formerly known as Main Story, is the "campaign mode" of Arknights.

The Main Theme is divided into three story arcs: Hour of an Awakening, Shatter of a Vision, and Shadow of a Dying Sun, which consists of 135 main operations, 22 interludes (5 of which are secret and must be unlocked by fulfilling specific conditions in certain main operations), 45 sub-operations, 22 Inferno Mode operations, and 19 tutorial operations, for a grand total of 243 operations.

The Hour of an Awakening and Shatter of a Vision story arcs belong to the first part of the Arknights storyline, unofficially referred to as the "Reunion Arc," while the Shadow of a Dying Sun story arc belongs to the second part, unofficially referred to as the "Victoria Arc."

Episodes

Prologue to Episode 04 were available upon the game's initial release, with more episodes added over time.

Release dates
Episode CN Global/EN TW
Episode 05 June 9, 2019 February 26, 2020 August 13, 2020
Episode 06 December 24, 2019 June 30, 2020 December 24, 2020
Episode 07 April 25, 2020 December 30, 2020 May 27, 2021
Episode 08 November 1, 2020 April 30, 2021 August 26, 2021
Episode 09 September 17, 2021 TBA

Hour of an Awakening

Prologue: Evil Time Part 1
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Episode 01: Evil Time Part 2
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Episode 02: Separated Hearts
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Episode 03: Stinging Shock
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Shatter of a Vision

Episode 04: Burning Run
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Episode 05: Necessary Solutions
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Episode 06: Partial Necrosis
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Episode 07: The Birth of Tragedy
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Episode 08: Roaring Flare
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Shadow of a Dying Sun

Episode 09: Stormwatch
Episode 09.png
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TR-19
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S9-1
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Inferno Mode

From Episode 05 onwards, each episode also includes four Inferno Mode operations that are added one week after the release of their corresponding episode, the first of which is unlocked by clearing the episode's last main operation.

Inferno Mode operations can be distinguished by the "H" prefix before the operation's episode and number (e.g. H5-1) and are considerably harder than the episode's main operations. They do not award anything aside from an Originite Prime.png Originite Prime when cleared with 3 stars for the first time and plaques for some, and they do not have a Challenge Mode version.

Unlike previous episodes, Episode 09 was released with three Inferno Mode operations immediately available, with three more added in the following week.

Episode 05
Episode 06
Episode 07
Episode 08
Episode 09
H9-1
H9-2
H9-3
H9-4
H9-5
H9-6
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