Investigation

Investigation  ( ソウサワ, Sousawa) is the one hundred sixth chapter of the  Nisekoi  manga series written and illustrated by  Naoshi Komi, published weekly in the magazine,  Weekly Shōnen Jump.

Summary
As Chitoge runs late for school, Chitoge hurriedly ties her ribbon only for it to untie and fly away.

At school, Raku runs into a surprisingly depressed Chitoge who explains to everyone about losing her ribbon. The group go around town after school in search of Chitoge's ribbon only to fail. Raku attempts to cheer her up by offering to treat her ramen. To his surprise, Chitoge rejects his offer causing Raku to worry of her depressed state in the future if her ribbon were never to be found.

Raku decides to buy a replica of Chitoge's ribbon after losing hope of ever finding the real one. He approaches Chitoge with the ribbon claiming he had found it at an alley. However, Chitoge notices that the ribbon wasn't actually hers as it came with a new smell. Raku asks Chitoge to forgive her as he thought simply buying a new ribbon would make up for it. Chitoge proceeds to thank Raku for actions rather than beating him up much to Raku's surprise.

Raku suddenly notices what looks to be Chitoge's ribbon on top of a telephone pole which Chitoge quickly runs up to. The ribbon flies away and Chitoge runs to retrieve it. Chitoge loses sight of the ribbon for a moment but suddenly sees it fly toward an incoming train where it gets caught and torn to pieces.

As Chitoge cries in agony over her ribbon, she tells Raku only for Raku to tell her that the ribbon that had been torn apart was actually the one he had just bought for her as it had actually blew away earlier. Chitoge smells the ribbon to reassure it was actually hers. After confirming it, Chitoge happily hugs Raku. A few moments later, however, Chitoge reverts backs to her blunt attitude to which Raku preferred compared to the soft persona she had without her ribbon.

Trivia

 * This is the first time Chitoge has lost her ribbon.