Mission of Smile Manager

When Kashiwagi transfers to Chiemi's school, sensei askes Chiemi to watch over him but even after a month since his transfer, Kashiwagi still doesn't get involved with anyone. Chiemi thinks it might be useless and annoying to keep trying to get close to him but continues trying to be friends with him anyways. But is it really as useless as she first thought it'd be...? (Source: Intercross)