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Tobi Otogiri, a second-year student in middle school, doesn't spend much time with his peers. Instead, he mostly chats in secret with his pal Baku, a mysterious backpack he received the day he last saw his older brother. Or at least, Tobi thought his chats were secret, until a girl in his class named Ryuuko suddenly mentions Baku. Soon, strange...

During a surprise reunion with his older brother, Seki, questions race through Tobi's mind. Why would Seki even be here? Is this person truly him? And if so, is he the same big brother Tobi remembers? As the peaceful days Tobi and Ryuuko once knew become little more than distant memories, the zingai incidents continue to ramp up! Amid the...

Wataru Aida struggles with communication, yet somehow he ended up with a job in sales. His sole source of joy is playing video games, where he immerses himself in the world and studies online strategy guides alone rather than interacting with other players. However, this all changes one day when his senior coworker Reito Kashima catches him looking at a...