Dimensional Chat Group: I became Hokage and was invited.

Renji Matsumoto Reincarnated in the world of Naruto, made early plans, and successfully succeeded as the Fifth Hokage after the death of the Third Hokage. Then, he received an invitation to join a super-dimensional chat group that spans all the multiverse. Interin President Su Lengleng: "The strongest Hokage? Are you the First Hokage Senju Hashirama, the Second Hokage Senju Tobirama, the Third Hokage Sarutobi Hiruzen, the Fourth Hokage Namikaze Minato, the Sixth Hokage Hatake Kakashi, or the Seventh Hokage Uzumaki Naruto?" Renji: "I am the Fifth Hokage!" Su Lengleng: "...I'm sorry, Sister Tsunade." Renji: "....I am not Tsunade!" Su Lengleng: "...Then who are you?"