Her first appearance takes place as she is been given a mission to assassinate someone in Japan. However due to her near-sightedness she thinks Tsuna is her target and attempts to kill him instead. However, after clarification she immediately drops the mission and even ends up living at Tsuna's house. She spends her time either helping out Nana Sawada or chasing Lambo. Once, I-Pin accidentally gives Kyoko and Haru her Gyoza-Kempo buns, which contain the essence of 5 million gyoza, enough to kill a normal person. Fortunately, Reborn shoots both Kyoko and Haru with a Dying Will bullet, and, as they had the same dying will, were both able to survive.
I-Pin, Futa, and Lambo are attacked by Levi A Than's Varia Lightning Strike Squad. After Lambo is hit, I-Pin does battle with one of the assassins to protect them. When Tsuna shows up, it is revealed that even this young I-Pin successfully held her own against a Varia member.
Arrival & Search for the Strongest Edit
Future I-Pin and Future Lambo are seen briefly for this period; they are being attacked by Nosaru and Tazaru while trying to lead Haru and Kyoko to safety by means of Lambo's entrance to the hideout. Before Future Yamamoto has a chance to finish Nosaru off, he reverts to his past self and she, Haru, Kyoko, and Lambo switch places with their past forms, their past forms being knocked unconscious upon Nosaru's attack.
While everyone was training for the Choice battle, Chrome Dokuro wasn't eating properly and joining the others. One day, I-Pin went to her room and offered her a gyoza bun. Both of them sat in the room and ate together. After that, Chrome was starting to open up to the other girls (Bianchi, Kyoko, and Haru), and they all somewhat became friends.
I-Pin was one of the participants in Fon's Trial, but I-Pin didn't even try to catch her master; rather, she watched Tsuna and the other participants try to catch Fon, though she did want to help. When the trial was nearly over, I-Pin, who was hiding in the shadows since the beginning, intervened and prevented Fon's escape. They fought briefly using martial arts and Gyoza-Kempo, but her biggest accomplishment was when she used Gyoza-Kempo on Lambo, attacking him to send Fon flying into Tsuna's lap.
I-Pin is not one of the participants in Choice and therefore watches the battle from the Vongola viewing area.
After returning from the past with the rest of Tsuna's Family, I-Pin was always seen together with Kyoko, Haru and Uni; however, they were interrupted when Zakuro, one of the Six Funeral Wreaths, attacked the Vongola Base. I-Pin and the other non-combat personnel were escorted outside by Tsuna and his Guardians.