Tsubaoi

Tsubaoi is the femslash ship between Tsubaki Aoyagi and Aoi Miyake from the D4DJ fandom.

Canon
The relationship between the two is technically a central theme not only of their unit's story quest, but in fact the very essence of RONDO itself. In particular, all of their songs with multiple vocalists are officially performed as a vocal duet of Tsubaki and Aoi, even though Hiiro often sings the backing vocal line. According to EMSS, the official lyric provider for RONDO, [Re]termination and Black Lotus is also united by the common idea that Tsubaki and Aoi are different sides of the same coin.

The most important source of content for their ship is the 2020 Valentine's Event, which was also the first such event in the game at all. In the RONDO Valentine's event, Tsubaki is shown wanting to give Aoi chocolates for Valentines Day, however she did not want to make it average. Tsubaki decides to tail Aoi one day, in order to notice something special and personalize Aoi's chocolates. However, Tsubaki ended up feeling more doubtful, due to Aoi's popularity and her inability to go anywhere without getting noticed by fans. In the end, Tsubaki ended up making the chocolates anyway, with the help and consultation of Hiiro, reassuring her that Aoi would be happy with any kind of chocolate she receives from Tsubaki. When Valentines Day finally came, it was no surprise that Aoi received many chocolates from fans. Tsubaki again felt discouraged but eventually got the courage to meet with Aoi alone that night in order to give her the chocolates. Nervous, Tsubaki finally took the plunge and gave Aoi her chocolates. To her surprise, Aoi also gave her chocolates in return. The two exchange the gifts while flustered.

It should also be noted that while the English translation still retains the necessary ambiguity for shipping, their original Japanese lines sound a little more intimate, such as when Aoi asks her to be considered a "romantic" because of Tsubaki's embarrassing because of her mannered acts, or when Tsubaki's mention of the way Aoi shared the umbrella with her has a more tender context, because words about a divided umbrella in Japanese have an ambiguous-romantic context and are often used for intimate or outright romantic scenes between characters.

After the Valentine's event, Aoi and Tsubaki have an area conversation for White Day where they give each other gifts in return for the chocolates. Tsubaki got Aoi gloves while Aoi got Tsubaki a muffler. Both of them end up blushing upon being presented the present.

It should also be noted that Aoi several times directly calls Tsubaki a very special person to her, repeatedly emphasizing how important it is for her to receive gifts or recognition from her. For example, during her birthday event, she is sincerely happy that Tsubaki congratulated her being the first one. In a few other stories, she also cites that her first meeting with Tsubaki in the church was a fateful one. Whether her feelings are romantic in nature is up to the audience for the time being.

Fanon
Tsubaoi quickly became the most popular ship in the franchise, both due to more or less confirmed attraction from Tsubaki, and due to Aoi's status as one of the most popular characters in the game. This was also particularly helped by the fact that most of the RONDO-related events or side content is in one way or another devoted to either the interaction of the two, or at least the attraction from Tsubaki. In this regard, due to the huge popularity of the ship and the frequent teasing of the authors, anyone easy can find a headcanon that the canonicity of this ship is either implied or directly confirmed in one form or another.

While the game itself is mostly trying to be ambiguous about it, there are a few exceptions as when the creators chose to unambiguously depict Tsubaki's attempts to make Valentine chocolates for the Aoi Valentine Event as romantic, and several episodes of Petit Mix actually confirmed the crush on her part. Aoi's second birthday illustration from the franchise's official illustrator also explicitly shows Tsubaki as angrily looking at the other girls' enthusiastic reactions to Aoi's ikemen looks.

Tsubaki's sexuality is still unknown, but in one way or another, she can be considered sapphic/queer, since she never shows even the slightest problems with the fact that she is attracted to another girl, and the only thing preventing Tsubaki from confessing directly is her shyness and lack of social experience.

This ship also causes some controversy among people who ship other pairings or aren't interested in D4DJ shipping at all, since a public expression of doubt about this ship often leads to various conflicts or even attacks. For example, the D4DJ fandom wiki even closed comments on both girls’ pages due to the fact that people were constantly arguing over the ship with each other.

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Trivia

 * Tsubaki and Aoi were the only characters to mention each other during the limited 2021 Valentine's menu lines (instead of just the player, just like every other character).
 * When Tsunko (Aoi's seiyuu) was asked to comment on one of her unit's performances on Photon Maiden TV, it was Rihona Kato's (Tsubaki's seiyuu) performance of Gunjou no Flor Seca, the song for RONDO's Valentine's event.
 * Due to Aoi's refusal to speak of her life goal with a smile during the RONDO introduction video, fans have often joked that her goal would marry Tsubaki.
 * In a menu dialogue, Tsubaki says that she has taken cooking lessons from Hiiro in order to "make a certain person happy" while blushing. Earlier in one of the events, it was confirmed that this person is Aoi.
 * In one of Aoi's menu lines, she ponders which shirt to wear before asking Tsubaki for her opinion.
 * During RONODO's D4DJ D4 FES. -Party Time- concert, one of the set lists was titled "Tsubaki x Aoi Setlist" and included the songs Movement, unravel, Calendula, [Re]termination and Onaji Hoshi.