Super Mario-kun Gekijou: Yoshi New Island

Overview

A side story manga to the long-running "Super Mario-kun" series, following the events of the 2014 3DS video game "Yoshi's New Island". Story goes as follows: "the couple to whom the stork delivered Baby Mario and Baby Luigi allege that the brothers are not their babies. The stork then flies away to search for the real parents, when he clashes with Kamek and his goons once more. Kamek proceeds to defeat the stork in a fight and kidnap Baby Luigi, but Baby Mario slips and falls on the nearby Egg Island. He is found by a group of Yoshis who decide to take him to his brother and defeat Baby Bowser, now that he is planning to turn Egg Island into his resort. After Baby Bowser is defeated at his castle, it is up to the iconic duo to head over to the stork and Baby Luigi to rescue them."

Source: AniList