Height: 148 cm (past), 175 cm (present)

Hinata's younger brother. He very much resembles his father.

Naoto is a righteous individual who is also determined to also save his sister. He has a no-nonsense personality and is usually unamused by others' humorous advances. He is also willing to embrace far-fetched possibilities, such as the fact that Takemichi can time-travel, and even make his own hypotheses about it.

Before the first time travel, he died together with Hinata. However, after he was warned of his death by Hanagaki and was subsequently saved, he grew up to become a detective and ended up playing a key role in Hanagaki's ability to travel through time. Naoto is the key to activating Takemichi's supernatural time-travel ability. Whether in the past or present, as long as the two shake hands, Takemichi will be transferred to the present (if he is in the past), or the past (if he is in the present). He is also the only person who is aware of the consequences caused by Takemichi's time-traveling aside from Takemichi thus far.