Kaiju — This visual novel belongs to the Kaiju genre. This genre contains giant monsters usually attacking major cities, other giant monsters, or the military.
Kanji Puns — This game has considerable number of Japanese-specific puns generally referring to the design, etymology, radical composition etc. of kanji. The puns may be made as a joke for comedy reasons, or they may serve a plot point.
Kantai Collection — This visual novel is set in the same universe, or features characters from Kantai Collection.
Kendo Club — Kendo club and the activities related to it takes an important role in this story. Kendo, meaning "Way of The Sword", is a modern Japanese martial art of sword-fighting based on traditional swordsmanship (kenjutsu) which originated with the samurai class of feudal Japan. Kendo is a physically and mentally challenging activity that combines strong martial arts values with sport-like physical.
Kidnapping — The game features kidnapping as a story element. In criminal law, kidnapping is the taking away or transportation of a person against that person's will, usually to hold the person in false imprisonment, a confinement without legal authority. This may be done for ransom or in furtherance of another crime, or in connection with a child custody dispute.