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I've compiled all the extra chapters from the "She Is Being Targeted" series and as far as I know, they are all canon.
Contents (chronological order): p01 - 『Tateishi Family's Daily Life』 〜Akiho-san〜 p04 - 『She Is Being Targeted』 〜Extra Edition〜 p09 - 〜Conversation Between Sisters After Takeshi Edition Chapter〜 p10 - 〜Takeshi and Hinako's Past 1〜 p17 - 〜Little Tease 1〜 p25 - 〜The Men Targeting Her 1〜 p30 - 〜The Men Targeting Her 2〜 p31 - 〜Little Tease 2〜 p39 - 〜The Men Targeting Her 3〜 p40 - 〜Takeshi and Hinako's Past 2〜 p41 - 〜The Men Targeting Her 4〜 p42 - 〜The Men Targeting Her 5〜