(母と子供部屋おじさんの1○年間の成り行きと、それから。) is a prominent Japanese adult visual novel developed and published by the indie circle Gekkan Toshiue Milk Tank . Available on digital distribution platforms like DLsite, this narrative-driven title dives deep into a taboo, highly unconventional domestic dynamic between an adult son living in his childhood room and his mother.
The title you're referring to is Haha to Kodomobeya Oji-san no 10-nenkan no Nariyuki to, Sorekara.
Tracing back to Hiroto’s childhood and teenage years, documenting how his introversion, social anxiety, and dependency slowly twisted his relationship with his mother into something transactional and deeply private. Haha to Kodomobeya Oji-san no 1--- Nenkan no Nari...
Within the niche community of maternal-themed visual novels ( bokei-ge ), Haha to Kodomobeya Oji-san received unique praise for its writing.
Alternatively, it might be a recounting a real-life observation: Tracing back to Hiroto’s childhood and teenage years,
The title uses textual choices alongside illustrated scenes to advance the narrative, tracking how a simple childhood withdrawal spirals into a permanent, lifetime domestic arrangement.
This "chronicle" format allows for significant character development and explains the psychological background behind their "secret relationship". three parallel lives have slowly
「母と子供部屋おじさんの１○○年間の…」
Hiroto represents extreme social withdrawal (akin to the hikikomori phenomenon). Lacking the coping mechanisms to deal with adult responsibilities, economic pressures, or peer relationships, he retreats into the absolute safety of his childhood bedroom. Over a decade, his psychological state regresses, viewing his mother not just as a caretaker, but eventually as his entire world. 2. Yoshizawa Rie (The Mother)
As the series continues (likely into a second year), readers are left with a haunting question: What happens when the arrangement is no longer temporary? The first year taught them survival. The second year will demand truth.
The “first year” is not about happy endings. It is about the nari : the ongoing, fragile state of becoming. Oji-san is still not the father. The mother is still not his partner. But the child sleeps soundly. And in that small room, three parallel lives have slowly, imperfectly, intertwined.