Passion Vol. 3 (manga)

Shima, a high school teacher, and Hikaru, now a college student, are currently lovers in a long-distance relationship. Burdened with preparations for the upcoming school festival, Shima can spare no time for a date, until he happens to hear a rumor that Hikaru, working part-time in a cafe, is being approached by an older co-worker there! Will the thought of an unknown rival competing for Hikaru's affection stir feelings of jealousy in Shima's heart?!