In 22-ji no Annaibito, Chiyo refuses to come to terms with her dog Choco's passing and falls asleep, only to awaken in the Night World guided by Yoru. As she navigates through this dark yet enchanting realm, Chiyo begins to find solace for her grief, witnessing the world around her illuminate. In 26-ji no Sagashimono, lifelong friends Hina and Tsumugi share an exchange diary symbolizing their bond. When Tsumugi's jealousy leads her to discard the diary after Hina befriends someone new, she is transported to a labyrinth in the Night World. Reluctant at first, Tsumugi grapples with her emotions of isolation as she seeks a way out. The 4-ji no Tegami follows Akatsuki, burdened by her career struggles and on the verge of abandoning her art. While sorting through her works, she rediscovers an old sketchbook holding a heartfelt letter from a past friend who once inspired her. As Akatsuki delves into memories, she unearths the identity of her long-lost confidante and reignites her waning passion for painting.