Ramen wo Tabete Iru Toki dake Naze ka Nounai de Kaiwa ga Dekiru Futari
Japanese title: ラーメンを食べている時だけなぜか脳内で会話ができる２人
Type: CM
Episodes: 2
Source: Original
Genres: Gourmet, Slice of Life
Studios: Studio Massket
Duration: 1 min per ep
Rating: G - All Ages

The story of Saki and Ken, who are mysteriously able to converse in their heads only when they are eating.

(Source: Official YouTube, translated)