Ichigo Kurosaki & Kon vs. Millipede-like Hollow

 is an altercation between a Millipede-like Hollow and Kon, who later receives some assistance from Ichigo Kurosaki.

Prelude
Rukia Kuchiki purchases a dispenser of soul candy from the Urahara Shop so Ichigo can separate his soul from his body without her help. Unbeknownst to her, the dispenser actually contained a Mod Soul. When the Mod-Soul, later known as Kon, takes possession of Ichigo's body, he, running amok, eventually arrives at the middle school which Ichigo's younger sisters attend. After a violent encounter with three schoolboys, Kon is about to leave the school when he, sensing the presence of a Hollow, doubles back. He arrives in time to save the boys from the attacking Hollow. Ichigo and Rukia, who have been searching for Kon to get Ichigo's body back, also arrive at the school, where Ichigo joins Kon in fighting the Hollow.

Battle
Fleeing to a rooftop to take the fight away from any Humans, Kon, stopping the Hollow's attack, sustains a hit, and is bleeding. Taunting Kon, the Hollow says someone as weak as him should not have interfered with his meal. Arriving, Ichigo, agreeing with the Hollow's sentiment, emphasizes it by chopping off one of its legs. When Kon does not understand why Ichigo saved him, Ichigo tells him when he uses his body to fight, he puts it in jeopardy. As he talks, he, pointing at the Hollow with his large sword, injures him in the process. As Kon claims he was only fighting because Ichigo took so long to arrive and he had to protect the children, the aggravated Hollow, attacking, is met with a double blow from Ichigo's sword and Kon's leg. Though this blow effectively finishes the Hollow, as he falls, he threatens to crush a trail of ants. Hurriedly kicking him away to prevent that, Kon puts himself (and Ichigo's body) in danger of falling off the roof before Ichigo manages to grab him by the shirt.

Aftermath
After the fight, Ichigo gets to know Kon, his history, and his stance about sanctity of life. When Kisuke Urahara arrives to retrieve his "damaged goods", Ichigo and Rukia, deciding they will keep Kon, take responsibility over him. Ichigo gives him the name Kon and a surrogate body in the form of a plush lion doll. Moving into the Kurosaki Clinic, Kon becomes an alternate means for Ichigo to turn into a Shinigami.

Trivia

 * In the anime, when Kon kicks the dying Hollow away, he does so to protect Hashigami, Kaneda, and Ino.