1x1 - Roller Coaster

Pure meets up with friends at her regular bar and unexpectedly runs into Air, her former lover. She quickly goes over to greet her, only to find that Air has brought along Loft-the younger sister of Lamp, Air's husband. From their very first meeting, Loft is instantly drawn to Pure and suspects that Pure and Air may have been more than just friends. Later, by chance, Loft runs into Pure again and invites her to a restaurant to get to know each other better. Pure begins to feel a sense of warmth and comfort having Loft in her life, yet she still finds herself waiting for Air's return. Meanwhile, the relationship between Lamp and Air begins to waver under family pressure for them to have a child together.