Asami Imai

This is the story of the Chain Chronicle, a book that describes everything that happens in the world. The citizens of the remote continent of Yggd once thought that there was nothing beyond their continent. The continent was divided into several regions, each with its own king. Though there were small skirmishes amongst them, a lord, chosen by the kings in conference, always maintained balance, until the evil Black Army arrived. The Volunteer Army, led by Yuri, was no match for the Black Army. During the fighting, the Lord of Black captures half of the Chain Chronicle, as well as the capital.

There was a time when there were ninja serving the powerful, hired for intelligence missions, destruction, or assassination. While the times have changed, the need for ninja has not vanished. In a particular school, there are girls who are secretly in training to become ninja. Ninjas-in-training, Asuka, Katsuragi, Hibari, Ikaruga, and Yagyuu each have a secret technique scroll that they protect at all times. This features their tumultuous school life as they pursue the path of the ninja!

The story is set in December of 2199, when the streets are full of anticipation for the end of the year and the start of the new one. Amid the celebrations, word spreads that Ragna the Bloodedge, an SS-class rebel with the highest ever bounty on his head, has appeared in the 13th Hierarchical City of Kagutsuchi. The apparent aim of Ragna or the "Grim Reaper" is the destruction of the system controlling the world. To collect the bounty, a motley array of unrivaled fighters converge on Kagutsuchi.

Koi to Senkyo to Chocolate follows the protagonist Yūki Ōjima, who attends Takafuji Private Academy a large school with over 6,000 students. Yūki is a member of the Food Research Club along with seven others, including his childhood friend Chisato Sumiyoshi. The members leisurely spend their time in the club not doing much activities. When the election of the next student council president comes up, the front runner Satsuki Shinonome proposes that clubs that have no merit should be sorted out and abolished. The Food Research Club seeks advice from the current student council president Yakumo Mōri, who suggests Yūki run in the election as an opposing candidate. Yūki learns about the issues facing the school and decides to run in the election.

Rintaro Okabe is a self-proclaimed "mad scientist" who believes that an international scientific organization named SERN is conspiring to reshape the world according to its own interests. He and his friend Itaru Hashida inadvertently create a gadget able to send messages to the past. The discovery and experimentation of this instrument become the catalyst of fundamental alterations to the present. Okabe is the only one aware of these changes because he possesses a Reading Steiner, the ability to retain the memories from previous experienced timelines. Oblivious of the consequences of their actions, Rintaro and his friends end up creating modifications of grievous proportions. He must then try to find a way to return as close as possible to the original timeline in order to save his precious lab partners.

The story takes place in a city-state enclosed by the sea. Merchants and adventurers alike gather within the city known as the "world's treasurehouse". It is a city of endless possibilities and dreams. Here it is that the somewhat odd story of an adventuress and her happy-go-lucky friends unfolds.