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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Oshi No Ko, Page 11

Oshi No Ko and Kaguya-sama Takes Place In the Same Universe??!

Oshi no Ko Theory: Kaguya-sama: Love Is War Is Set in the Same Universe

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

refugees – RABUJOI – An Anime Blog

Oshi No Ko and Kaguya-sama Takes Place In the Same Universe??!

Oshi no Ko / Characters - TV Tropes

Is Oshi no Ko and Kaguya-Sama love is war Related? : r/OshiNoKo

Oshi No Ko episode 3 confirms Kaguya Sama's existence within the anime