Yuuya Tenjou, long shunned and mistreated by all, including his own family, faces profound loneliness after his grandfather's demise, his sole source of love. Despite his relentless kindness, even the most virtuous souls have limits. Just as he nears his breaking point, a glimmer of hope emerges through a mysterious portal in his bathroom. This portal leads to a desolate mansion in another realm, granting Yuuya game-like abilities and ancient sage artifacts. Empowered by these extraordinary gifts, the once-rejected Yuuya embarks on a journey to unlock his full potential and rise above his past.