"Kud Wafter" is a short anime series that serves as a spin-off to the visual novel "Little Busters!" and focuses on the character Kudryavka "Kud" Noumi. The story is set during the summer break following the events of "Little Busters!" and centers on Kud's experiences as she stays at the dormitory while most of her friends have gone home. Riki Naoe, the protagonist, remains at the dormitory as well, and the narrative explores their growing relationship as they spend time together.

Kud faces challenges related to her identity and feelings of loneliness, stemming from her mixed heritage and the absence of her friends. Her interactions with Riki become a focal point, as they navigate their emotions and deepen their bond. The series incorporates lighthearted moments, such as their attempts to build a sandcastle on the beach, alongside more introspective scenes that highlight Kud's insecurities and her desire to belong.

The plot also introduces a minor conflict involving a mysterious construction project near the dormitory, which threatens to disrupt their peaceful summer. This subplot serves as a backdrop to Kud and Riki's personal journey, adding a sense of urgency to their efforts to preserve the memories of their time together. The series concludes with a resolution that emphasizes themes of friendship, acceptance, and the importance of cherishing the present.

The main characters include Kudryavka Noumi, whose cheerful demeanor masks her inner struggles, and Riki Naoe, whose supportive nature helps Kud confront her fears. The supporting cast, though less prominent, includes brief appearances from other members of the Little Busters group, reinforcing the sense of camaraderie that defines the series. The narrative maintains a balance between slice-of-life elements and emotional depth, offering a concise yet impactful exploration of Kud's character and her relationship with Riki.