The manga series Arpeggio of Blue Steel: Ars Nova, created by Ark Performance, begins serialization.
Announcement that Arpeggio of Blue Steel: Ars Nova will be adapted into an anime television series.
The anime adaptation of Arpeggio of Blue Steel: Ars Nova premieres in Japan.
The film sequel Arpeggio of Blue Steel: Ars Nova Cadenza, a continuation of the anime story, is released.
The mysterious Fleet of Fog appears worldwide, blocking power and disrupting naval activities with their advanced, heavily armed ships equipped with mental data networks.
The Fog submarine I-401 gains a mental model and eventually defects to the human side, focusing on protecting humanity rather than following Fog orders.
I-401 forms an alliance with human naval forces, led by Gunzou Chihaya, starting cooperative operations against the rest of the Fleet of Fog.
The combined forces of humans and I-401 engage the Fleet of Fog in a significant naval battle, demonstrating the possibility of defeating the Fog.
Conflicts arise among various Fog ships' mental models, especially highlighting differences in ideology and identity.
I-401 leads strategic campaigns to disable enemy Fog ships and works towards an understanding to reduce hostilities between humans and Fleet of Fog.
