KanaShu

KanaShu is the het ship between Sudou Kaname and Karino Shuka from the Darwin's Game fandom.

Canon
Shuka first takes notice of Kaname when he defeats the Rookie Hunter, Banda-kun, in a seemingly hopeless match. During his fight against Banda, Kaname receives a message from Shuka asking if he needed her help, to which Kaname is suspicious of and opts to handle himself.

Impressed and curious by Kaname's win, Shuka invites Kaname to her base: an old warehouse filled with bins and containers and old equipment. Upon seeing her, Kaname notes that he didn't expect to be invited to see a cute girl. She explains a bit about Darwin's Game and how it works to Kaname before requesting that he showed her his sigil. Kaname is confused and tries to explain to her that he doesn't know to activate his sigil or what his sigil even is, which makes Shuka suspicious that he might have underlying motives and attempt to kill him. During their "fight" Kaname notes her destructive fighting style and describes her as crazy while Shuka thinks that Kaname is a coward for running from a girl.

In the end, Kaname manages to pin Shuka down by learning to use his sigil at the last moment and surprising her. Shuka surrenders and therefore becomes allies with Kaname. Realizing that he didn't need to kill Shuka, Kaname passes out due to his adrenaline failing him - causing him to fall face-first into Shuka's chest, much to her embarrassment.

When Kaname comes to, he is shirtless but with pants intact at Shuka's apartment with Shuka napping on top of him. He momentarily panics before she wakes up and tells him how she was worried because of how long he slept, bandaged his wound from their fight and carried him home. She then leans in close and asks Kaname for a favor, which was that he make a family with her. At the beginning of episode 2, it is revealed that she might've actually meant start a clan which was the d-game equivalent of a family/trusted individuals, but the intentions of her line is debatable among the fandom. Since a player must be at least rank B2 to start a clan, Kaname (rank D4 at the time) asks her why didn't she start it since she was rank A4, to which Shuka blushes and says that in this type of scenario, the man should take the lead. Kaname is confused but accepts the reason anyway. As the two depart towards their homes, Shuka stares after Kaname has turned around with a soft expression before walking away herself.

Both Shuka and Kaname are invited to partake in the special Darwin's Game event: Treasure Hunt Game. Upon arriving at Shibuya, Shuka takes it easy and brings Kaname on an unofficial date around the city. The two are seen getting crepes together, then Shuka takes Kaname to a park. Kaname questions why they're there - still under the impression that they were there to kill other players - which Shuka replies with a short response of "it's romantic". They are later seen at a clothing store, where Shuka tries on numerous outfits and asks Kaname for his thoughts on them, when he stammers out that one looked nice out of embarrassment for being lost in thought, Shuka blushes and says that she'll buy the dress since he liked it.

When the Treasure Hunt Game starts the two are separated and Shuka tries to meet up with Kaname, not knowing that he was trapped in the Tower. In the tower, Kaname attempts to call Shuka to tell her where he is but can't for an unknown reason. The two eventually meet again after Kaname teams up with Rein and the Florist to defend themselves and the rings.

Fanon
It is currently the most popular ship in the Darwin's Game fandom because of its canonical status and large amount of shipping content both in the anime and the manga. Although the anime has just started airing Winter 2020, the ship has already gathered a growing fanbase.