Tawawa on Monday: Season 1 - Ai-chan and the Stairs to Adulthood (2016) - (S1E12) - Backdrops — The Movie Database (TMDB)

One Monday morning, Salaryman asked what Ai did during the Christmas day, which she initially refuses to answer. Later, she revealed that she 'has taken a step into adulthood', becoming from 'I-chan' to 'J-chan'.

Tawawa on Monday 1x12 Ai-chan and the Stairs to Adulthood - Trakt

Tawawa on Monday (TV Series 2016-2021) — The Movie Database (TMDB)

Tawawa on Monday

Tawawa on Monday Ai-chan and the Stairs to Adulthood - Watch on Crunchyroll

Tawawa on Monday: Where to Watch and Stream Online

Getsuyoubi no Tawawa (Tawawa on Monday)

Ushiro no shoumen daare (1991) - IMDb

Tawawa on Monday: All Episodes - Trakt

Tawawa on Monday: Season 1 - Ai-chan and the Stairs to Adulthood (2016) - ( S1E12) - Backdrops — The Movie Database (TMDB)