Atypical ABO, a gentle Omega who is not affected by pheromones (possibly a normal person) and a pseudo-domineering, fragile and low-self-esteem Alpha.
Because a marriage contract entangled three people (actually they did not), pseudo-sister-in-law literature brings out a lot of sexism issues from the trivial relationship.
It turns out that what we pursue all our lives is just to live freely under the stars and the sea.
Purpose: Pursuit of gender equality and freedom