Kizumomo

Aki is a young part-time worker who loves freedom. He spends his days in a constant lethargy and feeling unable to stay in one place for too long, he often takes long trips on his bike. In one of these trips, he mets Masaya, an ambitious aspiring watchmaker. The two have opposite personalities and initially clash. The two reach better terms when Masaya is able to see Aki's inner pain. Eventually, Masaya uncovers Aki's sad past which was supposed to be held secret from everyone.
(Source: Wikipedia)