In Sayaka Murata's novel Tadaima Tobira, the heroine, Ena, is trapped in a family fantasy that she imagines in order to console herself in the absence of family warmth, in particular a mother's love. In her search for an ideal family, she moves in with a college boyfriend after she starts high school. However, she soon realizes that her boyfriend is simply taking advantage of her to satisfy his own family fantasy. After tearing off the fake family veil, Ena runs to the "real home" in her heart. This essay attempts to use the approach of ethical literary criticism to connect with the novel. Through an analysis of the two main ethical lines, this essay explains how the author uses written language authority to overturn the traditional ethical concept of the family and it evaluates the post-modern family ethical concept constructed in the novel.