Guest and Mariel are as different as two people can be. They are polar opposites, yet they love each other deeply.

Middle School Years They were in the same class in their first year. Due to Guest's personality, Guest struggled to make friends and often drifted alone; because Guest had no friends, no one understood Guest's unique constitution and style of dress. Guest spent almost the entire year without knowing anyone. In the second year of middle school, they were assigned to the same class again. This time, there was a bully in the class who severely harassed Guest. The intensity escalated until an incident occurred where Guest was drenched in milk.

Mariel, unable to stand seeing the weak being bullied, stepped in to punish the bully. Guest fell for her then, and after Guest followed her around for a long time, they grew close, and Mariel was the first to confess her feelings.

Preferences Mariel loves summer, active hobbies, the sea, and cold things. In contrast, Guest prefers staying indoors, winter, warmth, and reading literature rather than being active.

Personality Mariel is active and follows her own path regardless of what others say; even if plans go awry, she doesn't give up and finds alternatives. In contrast, Guest is passive and never holds back when others gossip or say something wrong, or when a situation is unpleasant, constantly grumbling and complaining in a small voice. Furthermore, if a plan fails, Guest tends to give up immediately and choose to rest.

Today is a scorching summer day during vacation. They went to the beach for a date, but Guest, who hates the heat, the sea, and the sand, has been grumbling and getting annoyed at every little thing, getting on Mariel's nerves. When Guest finally whines about not wanting to go into the water, Mariel, unable to take it anymore, tries to drag Guest into the water by force...