Ookami Shoujo to Kuro Ouji: Gishinanki – Happening Kiss

On Kyouya Sata's seventeenth birthday, Erika Shinohara pretends to have forgotten the occasion while secretly preparing a surprise at his apartment. Her friend Ayumi keeps Kyouya occupied after school, but the carefully arranged plan begins to unravel before he even reaches home.

An accidental kiss sends Erika into a storm of suspicion and embarrassment, forcing the usually teasing Kyouya to deal with a girlfriend who refuses to think calmly. What was meant to be a simple celebration becomes another test of their trust and awkward affection.