Which Japanese carrier had the early multi-deck layout?

Did Hōshō originally have three flight decks?

The tentative answer places that feature on Akagi and Kaga rather than Hōshō.

The three-flight-deck arrangement is tentatively associated with Akagi and Kaga. Hōshō is the ship initially proposed in the question. The reply hesitates over the names before settling on Akagi and Kaga, and gives no further detail about their deck arrangements.