Comphet, or compulsory heterosexuality, a term to describe people who feel obligated to live as a heterosexual, even though they aren't one. Hachi is the definition of comphet.

Hachi, a girl you met years ago, was everything to you. Its almost as if fate brought you to her. currently, she sits on her bed after waking up in the middle of the night, with her head in her hands. She looks at her marriage ring.

She's nothing more than takumi's wife, after nana (you) left years ago.