The Tweet explains that Kobayashi passed on April 17 from kidney cancer that he’d been battling for two years.
Alongside the works references in the first paragraph, Osamu Kobayashi also directed episodes of Gurren Lagann, LUPIN THE 3rd PART4, and Panty & Stocking with Garterbelt.
It’s unfortunate to say that he ran out of strength after battling kidney cancer for the past two years…