Otokojuku: a private school for juvenile delinquents that were previously expelled from normal schools. At this school, Japanese chivalry is taught through feudal and military fundamentals. Similar to an action film, the classes are overwhelmed by violence. Only those who survive it become true men. (Source: ANN)

Draw your weapons and take aim, because Sabagebu! is coming at you! Momoka Sonokawa was just minding her own business on the train one day when she encountered a pervert. Before she could do anything about it, a girl named Miou appears, brandishing two pistols and and scaring him off, only to be arrested herself a few minutes later for possessing firearms. Later Momoka sees this same girl at her school and follows her to a run down building. It turns out Miou is the president of the school's Survival Game Club, and it doesn't take long for Miou to capture Momoka and force her into joining them. Over the course of the series, Momoka and her new “friends” will take part in multiple battles against enemies from other schools, a rival from the same school who wants to see the club shut down and even each other (on multiple occasions). With friends and classmates like these, will Momoka even make it to graduation?

College student Miyako Hoshino is quite shy around other people. She mostly spends her time in her room making cosplay outfits. When her fifth-grade sister Hinata brings her classmate Hana Shirosaki home, Miyako instantly becomes captivated with Hana's cuteness. 

Miyako tries to do various things, ranging from making Hana wear cosplay dresses to giving her sweets. This gives Hana a bad impression of her at first, but Miyako will do anything to grow closer to the angel who has descended before her.

[Written by MAL Rewrite]

The year is 2356 A.D. - 189 years after a distant supernova caused a global catastrophe that wiped out 99% of the world population. To keep track on all space activities, mankind has built colossal space stations called "foundations" all over the Solar System. After passing the Space Academy entrance exams, Shima Katase embarks to the Earth-based foundation Stellvia to fulfill her dream of seeing the galaxy and to prevent another interstellar catastrophe from destroying Earth. (Source: ANN)