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Warm and lively Hokuto-chan; handsome and mysterious Seishirou. They are
Subaru's eternal guardians and companions with their contrasting personalities.
Both bring a different spark to the TB world and enriches the story further more.
Hokuto and Seishirou obviously enjoy each other's company given their many
differences. Bonded by a mutual love for Subaru, both of these special individuals
will go to great lenghts for him and protect him at all cost. They both love to see
Subaru-kun in his state of happiness, constantly teasing him with harmless jokes
of getting married to Seishirou and the overall relationship of the two male lovers.
On the other hand, the duo also like to speculate on speedily-changing Tokyo,
making light-hearted comments on the city's beauty and enjoying its many
sceneries and panoramas.
Guardian angels
Hokuto is often ecstatic and hyper on the prospect of Seishirou and Subaru's
blossoming relationship. She's over the moon that his twin has found such a
caring and tending lover, therefore she puts a great deal of trust and confidence
in Seishirou as Subaru's mentor and guardian. Hokuto'd always hoped that his
brother can find the confidence and guiding he needs in the comfort of his romance
with Seishirou, with him as his guiding light and protector. Nevertheless, there are
times when Hokuto's suspicion is aroused and she starts to doubt Seishirou's real
identity, silently questioning his mysterious past and family background. Being the
quick and intuitive person she is, Hokuto had sensed that something was "not quite
right" from the beginning. She could not disregard the fact that Seishirou's surname,
"Sakurazuka" 's close resemblance to the Sakurazukamori clan was a mere coincidence,
not to mention that Seishirou is always engulfed by an aurora of mystery and enigma
which Hokuto finds bewildering and uncanny. Seishirou, on the other hand, will
quickly dismiss any chance of Hokuto's inquisitive mind to taint their relationship by
cleverly changing the subject or directing her attention to another matter. With
consideration for Subaru, Hokuto is always ready to discontinue the discussion in
fear of spoiling his relationship with his brother.
The fact that Hokuto had not
further contemplated her doubts about Seishirou points out the possibility that
she is allowing Subaru to experience the traumatising and heart-wrenching
rejection of his love by Seishirou at the end of TB. Was there anything Hokuto
could've done to save his brother from the sad news? We are compelled to
believe that Subaru will hear it from Seishirou one way or another in the end,
and it will undoubtedly shatter his fragile heart. Despite her many concerns over
Seishirou's past and intentions towards Subaru, Hokuto chose to ignore such
thoughts lingering in her mind and encourage the Seishirou to pursue the
relationship with Subaru.
Friendship factors
As with Subaru's submissiveness, Seishirou often conform to Hokuto's joking
manner and provoke his bishounen lover into a frenzy of non-stop blushing and
perpetual shyness. As Seishirou has "helped" Hokuto with caring for Subaru,
Seishirou also enjoys Hokuto's cheerful nature and finds in her the help and
assistance he needs to make Subaru relinquish his guilty conscience and enjoy
the days that pass by.
Moreover, however different, Hokuto and Seishirou provide
the love that Subaru often feel his life is lacking and reassure his guilty conscience. Seishirou and Hokuto are of tremendous assistance to each other, with their
different assets and personality. Whilst Seishirou is always amused by Hokuto
-chan'ssense of humor, he finds that Subaru's cute twin brings a sense of life
and energy into the disposition of his formerly loveless and impoverished soul.
Both are forever inseparable and eternally grateful for the support and strength
they'd given to weak Subaru-kun as well as each other's friendship.
Having gained each other's trust, Sei and Hokuto-chan openly display an immense
amount of affection and fondness for each other. This can be seen in the way
that they're closely attached and like to share out daily household chores and
errands in the security and consolation of their friendship and partnership. Despite
the pleasure and joy Subaru gives to their life, Seishirou-san and Hokuto cannot do
with each other's presence. 
We see that every day brings them a step closer in TB,
and the strong affinity of their friendship sets the foundation of the story, of which
the Tokyo Babylon story is based upon. Both are equally important to each other, and although Hokuto despise the idea of interrupting Su-chan and Sei-chan's
romantic moments, she can't help but be there to share the essence of joy and
the family love of a fitting trio. As much as she enjoys embarassing or "helplessly humiliating" his twin, Hokuto wants the course of Su and Sei's relationship to run
smoothly more than anything in the world.