Kyou, Orenchi Yotteku?: Kou 3 no Natsu

Seto and Kikuchi, who've gone from close friends to lovers, plunge into the entrance exam season in summer. Kikuchi doesn't know what he wants do, while Seto doesn't know what to major in due to how far the university is. The two start to slightly differ from each other due to their anxiety about the future. What's more, Seto got involved in an accident...?!

(Source: Kaiohsha, translated)

Note: Includes one extra chapter.