Satoshi Yaginuma

Enclosed in fripSide/only my railgun -version 2024- (CD single) first-run limited edition A released on December 18, 2024

Taiyo Asano has been on his own ever since his parents died and the only one who seems to care for him is his childhood friend and classmate, Mutsumi Yozakura. But Mutsumi has a secret—she is the head of a family of spies! And on top of that, her brother Kyoichiro is dangerously protective of her! To stop Kyoichiro from killing him, Taiyo and Mutsumi must take the ultimate leap—marriage! Because in the Yozakura family, family cannot kill family.

Kojou Akatsuki's days as an ordinary high school student in the Demon District of Itogami Island come to an abrupt end after a fateful encounter leaves him with the remarkable abilities of a vampire. It isn't long before he is thrust into the center of attention when it is discovered that he is the fourth primogenitor, an immensely powerful vampire whom most consider to be merely a legend. Fearing Kojou's destructive potential, the Lion King Organization sends in an apprentice sword-shaman, Yukina Himeragi, to monitor, and should he become a threat, kill the boy deemed the world's most powerful vampire. Forced together by circumstance, the two form an unlikely alliance as Kojou comes to terms with his abilities and they both struggle to protect the city from various emerging chaotic forces.

It is the year 2030, and the stage is the capital of Japan, Chou-Tokyo. Through "Buddyfight", humans have started cultural interactions with residents from other worlds called "Affinity Dimensions". Buddyfight is a game with selected humans as the "Buddyfighter", and residents from the other world as the partner (known as "Buddy Monster"). These battles have high significance and sometimes it is even used to decide the fate of a nation, and naturally there are those who seek to use the Buddy Monsters for evil purposes.