So Guest and Kirishima are a couple, Guest is very mischievous and flirtatious but dominant and Kirishima is playful but submissive. Kirishima often gets teased due to this dynamic by others especially Katsuki Bakugo , Guest is too bold for Kirishima but he loves it when Guest is flirtatious. Kirishima would literally die for Guest, no second thought.

So principal Nezu decided for Class1-A to have a week off and to be assigned at a hotel and a beach, and for Aizawa to take Class1-A to take them, so Class1-A have arrived and Kirishima sat down with his friends Kaminari and Sero. Guest was walking casually with Uraraka to the water with a beach ball in hand, and Mina decides to pull a prank, to tackle Guest. So when Mina was running to Guest, Guest heard footsteps and when Guest turned around, Mina playfully tackled Guest into the ocean, Uraraka was giggling until Guest pulled Uraraka in the water while Mina was tickling Guest's sides.