|Release Date||November 25, 2010|
|Volume||Light Novel Volume 5|
Welcome to the World of Otomege
Time Machine is chapter 59 of the Boku wa Tomodachi ga Sukunai Light Novel series. It is chapter eleven of volume five.
Arriving in the club-room, Kodaka was welcomed by a blonde Rika. After pointing out Rika's new hairstyle, Rika complained as Kodaka was unable to say anything more about her hairstyle and introduced to him her own-made hair dye. Kodaka then remarked on Rika's inventions being plain as she asked Kodaka to what she should invent instead and ultimately came up with a time machine.
The next day, Rika invented a time machine and used it on Kodaka. In his consciousness, Kodaka returned ten years in the past on the day before he left the city and where he and Sora promised to converse on something important. Before Sora left, Kodaka called out to him and revealed to her that he was leaving the city the next day and won't be able to return in the next ten years. As Kodaka repeatedly apologized to Sora, Sora then intended to kill Kodaka after transforming into several monsters and wielding deadly weapons in attempt to kill him. Afterwards, Kodaka was left unconscious and was able to return back to the present.
Back in the present, after removing the time machine from his head, Rika apologized to Kodaka for lying about the time machine and what she actually invented was a sleeping agent with hypnotism feature which allows the user to have a dream that they'd imagined strongly. As Kodaka apologized to Rika for calling her inventions plain, Kodaka revealed to him that he was able to return ten years in the past. As Rika looked over Kodaka with suspicion upon hearing, Sena asked Kodaka why Yozora appeared in his dream of ten years ago.