Kira and Rei's paths converge one day while Kira is engrossed in painting. Their bond deepens gradually. Yet, the entry of Makio into their school initiates a dramatic shift in the fates of all three.

After violently confronting the culprit who stole Kira's painting, Rei faces school suspension. Concerned about Rei's violent nature, Makio encourages Kira to reconsider their relationship.

Kira hears from Makio about Rei's brother, Sei, and once again acknowledges her limited understanding of Rei. She contemplates how she can be there for him.

Reuniting with his ex-girlfriend Shiori, Rei discovers that her feelings for him persist. Meanwhile, Makio leaves Kira perplexed by sharing the complex history of love among Rei, Shiori, and Sei.