I seesomeone got to it after all.

Also, she's not using Kaga-shan anymore?

Jarlath said:

Also, she's not using Kaga-shan anymore?

It's age progression. I guess Zuikaku is leveling up, which translates to getting older. But if the war is over, how is she leveling up?

Onikamikun said:

It's age progression. I guess Zuikaku is leveling up, which translates to getting older. But if the war is over, how is she leveling up?

Training?
Maybe she is hitting targets in the backyard.

Onikamikun said:

It's age progression. I guess Zuikaku is leveling up, which translates to getting older. But if the war is over, how is she leveling up?

Pretty sure there still some use for the shipgirl even after the war is over. There are another strip where Kaga still work in the Naval base.

Onikamikun said:

It's age progression. I guess Zuikaku is leveling up, which translates to getting older. But if the war is over, how is she leveling up?

Fleet exercises. Slower but safer. Also in preparation for the next crisis, as they're much cheaper to maintain than traditional ships and crew.