Throughout the series, Takemichi's relationships with his friends evolve significantly. Initially, he struggles to connect with his friends due to his timid and passive nature. However, as he gets involved in time-traveling and tries to change the future, he becomes more assertive and protective of his friends. This leads to stronger bonds, trust, and mutual support between Takemichi and his friends. They all grow together, facing challenges and obstacles that strengthen their relationships. Overall, his friendships become a crucial driving force for his growth and determination in the series.