Why Pick a Fight With Him? Every Animal in Tokyo Is His Underling

After reaching max level in another world, he transmigrates to Tokyo and becomes the third-generation heir of a conglomerate family. From the start, his throat is slit, but he manages to kill his assassin in return. He can communicate with animals. Turning the tables against all odds, he leads a colony of ants to take down the killer and reclaim his identity.

This is Tokyo in the 1990s, before smartphones existed and computers were commonplace. And yet...

"...Shihodo, can I be your friend?"

"...Itsuki, my embarrassing spot is so itchy. Could you scratch it for me?"

Most of his peers shun him, so he's glad when girls take the initiative to befriend him. But they're... all so strange...