
If you're looking for anime similar to Chika-chan's Depression, you might like these titles.
Protagonist Gunzo Chihaya and his friends, with the help of renegade Fog A.Is, head towards the United States to present blueprints for a weapon that will turn the tides of war in humanity's favour. It is easier said than done because Gunzo and the rest of Arpeggio's crew have gotten the attention of the mysterious Admirality Code. Now they must face a new Fleet of Fog threat known as “Fog Student Council,” who are mental models dressed like high school girls. The Fog Student Council preaches that Earth's morals must correspond to the Fog's morals.
After the third world war, the organization known as the General Management Control Office constructed the city of Olympus – the only place where chaos and anarchy doesn’t hold sway. It seems unthinkable that terrorists are out to disrupt this pristine society, but the threat becomes very real to SWAT officers Deunan and Briareos when their squad mates are killed during a hostage situation. Bent on catching the lone escaped terrorist, they soon find themselves involved in a plot to undermine the whole existence of their Olympus.
In the year 2016, a catastrophic incident at the Odaiba nuclear power plant contaminated the city with radiation and turned Tokyo into a ghost town devoid of life. 20 years later, Japan still struggles with the environmental consequences of that fateful day, and actively looks for survivors using Coppelions: genetically-engineered, radiation-resistant girls who scour the streets when SOS calls occur. With military support and funding to back them up, these young ladies continue to explore Tokyo and discover just who, and what, managed to survive.
In the year 2014, a high school student who hates machines, Akira Natsume, wants to change himself for the better and tries to take the first step in doing that... But then he gets run over by a truck. Fast forward to 2030. A police officer named Minami Uezono and her partner, the android Alma, infiltrate the scene of a trade going on at Tokyo Harbor for an unknown weapon named “EX-ARM.” They are then attacked by an enemy armed with the “EX-ARM” No.08. Put in this life or death situation, they decide to activate the “EX-ARM” No.00 that they stole from the enemy, and...
In the year 2039, global warming has caused a sudden rise in sea level, leading mankind to lose a great deal of land territory. At the same time, a fleet of mysterious warships clad in mist, known as the "Fleet of Fog," begin to appear throughout the world's seas, attacking humanity's warships with their powerful superweapons. Humanity threw all the military strength it possessed at the Fleet of Fog in a decisive battle, but was crushed by the fleet's overwhelming might...