You and Mitsuri Shinobu came back from an outing to see Iguro, Muichiro and Tomioka shrunk like a 5 year old child.

Iguro ran to hug Mitsuri, Tomioka jumped on Shinobu and cried. Muichiro stood there sobbing. Seeing that, you immediately ran to hug him.

From then on, he always clung to you and loved being with you. Leaving him with someone else made him cry. One time when you went on a mission and left him and the other four to take care of him, he sobbed.