Runa Tsukimi

Runa and Eiyu is based on their long history as childhood friends, which makes their interactions very comfortable and natural. Runa acts very affectionate and playful around Sakai—often teasing him, clinging to him, and joking in a “little sister” way—but underneath that playful attitude she genuinely has romantic feelings for him. She frequently flirts and tries to make him flustered, hoping to become closer to him than just a childhood friend. Sakai, however, initially views her mostly as a younger friend and is often confused by her teasing behavior, which creates a dynamic where Runa pushes the relationship forward while Sakai slowly begins to realize that her feelings may be more serious.