Ruruyoi

Ruruyoi is a het ship between Sonosuke Izayoi and Ruruka Andou in the Danganronpa series.

Canon
Both Sonosuke and Ruruka were apart of Class 76th. They are a romantic couple and close since childhood, which is confirmed by their school profiles. Sonosuke is the type of person who doesn't like to speak or interact with others, with Ruruka being the exception. According to the relationship chart, they have a mutual trust and reliance on each other. He says that he cares about Ruruka more than he cares about himself. When the Incident occurs in the Future Foundation, Sonosuke is seen carrying Ruruka in his arms in multiple scenes; as he wants to protect her, cares about her, and loves her.

Sonosuke is shown to be intimate with Ruruka, such as laying his head on her lap but seems to be seeking Ruruka's candy as a reward, as he happily allows her to drop sweets into his mouth. The two seem to be partners, Sonosuke protecting Ruruka, and receiving her treats as a reward. He has been laying on Ruruka's lap since they were kids and seems like this is a trademark that is rather comedic.

After Ruruka told Sonosuke not to betray her, he swore he wouldn't "by love and delicious sweets". However, when Sonosuke discovers a secret exit, Ruruka appears to be so afraid of a possible betrayal that she kills him by breaking his NG code, betraying him before he can betray her. When they're alone, Ruruka pulls him into a kiss and then puts a sweet in his mouth. Sonosuke tastes the sweet and his NG Code activates the poisoning that Monokuma had explained earlier on. However, when Ruruka pulls away; she describes how she didn't want Sonosuke to betray her. Sonosuke doesn't consider it a betrayal and says that he loves her, giving her one final kiss right before he dies.

It's been described that at least some of Ruruka's candy are as strong as narcotics and give her an ability to control other people. However, while Sonosuke really loves her candy, it seems he is not addicted to them in this manner as he continues to protect and truly loves her while not allowed to eat any candy during the Final Killing Game.