Tachikawa Squad

"Alright, listen. I'm gonna say something good. Look at our emblem. There are three swords, right? This first one is me, the second one represents Izumi, and the last one is... My second sword. In other words, you're still a novice, so no getting puffed up. [...] Kunichika, you're the crescent moon on the back."

- Kei Tachikawa to Takeru Yuiga

Tachikawa Squad is the A-rank #1 Squad in Border. It is led by Kei Tachikawa.

Uniform
The squad's uniform consists of a long black coat with red vertical stripes somewhat similar to pinstripes and five straps to fasten it, and also black pants and boots.

Emblem
The squad's emblem consists of three s in front of a crescent moon. According to Tachikawa, the first blade represents himself, the second represents Izumi, and the third represents his second sword, while the crescent moon in the back represents Kunichika, but it was later revealed the third sword is their former member, Kyōsuke Karasuma.

Background
Tachikawa Squad's third member used to be Kyōsuke Karasuma until around a year ago (as of Chapter 39) where he and Shiori Usami transferred to Tamakoma Branch for unexplained reasons, however Takeru Yuiga took his place as the third member ever since.

Black Trigger Capture Arc
Kei Tachikawa and Kōhei Izumi along with Fuyushima Squad, and Kazama Squad, return to Mikado City following their Away Mission. After their return, Masamune Kido orders them along with Miwa Squad, to capture Yūma Kuga's Trigger with the Captain of Tachikawa Squad, Kei Tachikawa being assigned to be the leader, leading them to be the Antagonists of the Arc.

The Temporary Force then fights against Yūichi Jin, and Arashiyama Squad in the Yūichi Jin and Arashiyama Squad vs. Border's Top Teams fight, which the force was repealed.

Second Large-Scale Invasion
Tachikawa and Izumi fight in different parts of the invasion, with the former taking down Ilgars and assisting Murakami in killing the Rabbits and the latter going up against Ranbanein, then Hyrein.

B-Rank Wars Arc
Tachikawa Squad is on Defense duty during Round 2, and it is revealed that Tachikawa goes to Taketomi to listen to commentary recordings of the Rank Wars. Tachikawa commentates for Round 3. Before Round 4, Izumi and Yuiga help train Osamu.

During Galopoula's Invasion, Tachikawa fights against Ratarykov and Gatlin. During this, Izumi is commentating for the ongoing Round 5 match between Kakizaki Squad, Tamakoma Second, and Katori Squad.

Away Mission Test Arc
They, along with the rest of the A-ranks, judge Phase 1 of the test.

Trivia

 * The uniform of Tachikawa Squad is a homage to Masafumi Shinoda, Tachikawa’s sword teacher.