YoshiDen

Yoshiden is the slash ship between Hirofumi Yoshida and Denji from the Chainsaw Man fandom.

Canon
Yoshida and Denji only had very few interactions in the first part of the manga during International Assassins Arc where Yoshida had to protect Denji and they only interacted a few times in the second. Denji didn't even remember Yoshida anymore when he had come to tell him about an organization he was part of.

They first met in chapter 55 (volume 7) and meet again in chapter 103 (volume 12 or 13).

They both have the same mentor, Kishibe.

Fanon
Yoshiden was an unpopular ship during the first part of the manga but gained popularity during the second part. This is the third most popular ship in the manga with 100+ works on AO3, the second (and first romantic one) for Denji and the first for Yoshida.

Some fans imagine that Yoshida would be gay because he rejected the advances of a girl and would be in love with Denji because he seems to be very interested in the latter.

Many fanfics have it that Denji discovers he is bisexual when he finds out he is attracted to Yoshida. There are also a lot of smut fanfictions where Yoshida pays denji to have sexual relationships with him.

Their very opposite personalities are also appreciated by shippers.

In just one month since their reunion, the ship has become one of the most popular in the fandom.

Fandom
FAN FICTION

TUMBLR