The title uses the Greek letter Φ (phi) to represent to the "fi" (ふぁい, fai) in the Japanese transliteration of the English word "final".

[citation needed] The situation of Final Approach involves an experimental government operation (dubbed the "R.T.P."

This, in theory of the story and in today's world, would produce an astonishing net increase in childbirth, if young couples were to begin having children during an early relationship.

While the economical and political gains are great, the social and emotional aspects of the "subjects" in the project are easily assumed adamant in defending the previous method of marriage.

Living with Akane since a young age, Ryo is seen as the ideal brotherly figure to his sister, to the extent of being humorously overprotective.

Throughout the series (except the end), Ryo has always been in defiance to the arranged marriage, and he exercises that by rejecting Shizuka and her attempts to court him.

In later episodes however, it is shown that Shizuka's approval is only a pretense for the emotional pain she is going through, caused by the sadness welling up inside her (mainly due to Ryo's relationship with Emiho).

Shizuka is mostly Ryo's fiancée because of the Japanese government's secret childbirth program, but disclosures later on reveal that her grandfather has a hand in the matter.

When his wife died two years before the events of Final Approach, Shizuka's grandfather went back to reminiscing about his first love.

The grandfather, knowing this, asks Shizuka to marry Ryo, as a sign of realization of his lost love, which seems to be his only wish left in his lifetime.

In the end, Ryo, realizing the real Shizuka and her passionate love, came to her hometown, fully accepting their marriage status from having developed so strong of feelings for his fiancée.

The fact that she fears this happening and that she finds happiness in her brother's presence may imply that Akane has diminutive amorous feelings for Ryo.

Coming from a wealthy family, it wasn't long before Emiho was in a political marriage; Ryo felt a connection to her due to his similar situation.

During the scene where the group is taking shelter within a log cabin, Shizuka recommends sharing body warmth as a source of heat.

Miki, after concluding that Akane will be cared for by Ryo, proposes to Emiho to be her sharing partner, while hinting that homosexual acts will be involved.