Latest chapter of manga Oshi no Ko confirms that it's taking place in the same universe as Kaguya-Sama - Forums

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Renai Daikou is from the same universe as oshi no ko and kaguya-sama : r/Renai__Daikou

Kaguya-sama: Love Is War (Manga) - TV Tropes

Kaguya-sama: Love is War, OT, How cute., Page 5

Kaguya-sama wa Kokurasetai: Tensai-tachi no Renai Zunousen Chapter 281 Discussion (50 - ) - Forums

Kaguya-sama: Love is War, OT, How cute., Page 5

Kaguya-sama: Love Is War / Characters - TV Tropes

Kaguya-sama: Love is War, OT, How cute., Page 5

The Connections between Kaguya-sama and Oshi no Ko

Is Oshi No Ko related to Kaguya sama? Explained