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新宿スワン - 和久井健 / 第２６６話 宣戦布告 - コミックDAYS

The manga was originally serialized in Weekly Young Magazine and concluded in 2013 with 38 volumes. For those looking to catch up on Chapter 266 or the full series:

The title "Declaration of War" refers to the formal escalation of conflict between the scout agency Burst and its competitors.

In this chapter, the brewing tensions between rival scout agencies reach a breaking point. Key developments include: