Lion meets HachiClo
Japanese title: 「ライオン」meets「ハチクロ」
Alternative titles: March Comes in Like a Lion, "3-gatsu no Lion" 14-kan Eco Bag-tsuki Tokusou-ban PV
Type: CM
Source: Manga
Episodes: 2
Status: Finished Airing
Aired: Dec 21, 2018
Duration: 36 sec per ep
Rating: G - All Ages
Studios: Shaft
Genres: Slice of Life
Themes: Parody
Demographics: Seinen

The ad's crossover theme matches a tote bag bundled with 14th tankoubon of 3-gatsu no Lion, the events depicted in the ads occur after the 2nd season and contain some spoilers. 

Hinata Kawamoto see two girls carrying rabbit-print tote bags. The girls are none other than Hagumi Hanamoto and Ayumi Yamada from Hachimitsu to Clover. Hinata immediately runs home and then to the bookstore to buy a copy of the 14th manga volume to receive her complimentary tote. 

In a second ad, Rei Kiriyama is coaching the team in shogi at Fujiwara Design.

(Source: ANN)