One of anime’s most well-loved romantic comedies, Toradora!, is commonly mistaken for a shojo series due to its reputation as a sweet and heartwarming love story. However, the series is actually based on a shonen light novel by Yuyuko Takemiya and, as a result, embraces many clichés of the genre. Most anime fans associate shonen storytelling with bombastic action and fast-paced storylines that leave no room for romance.
Source:https://www.cbr.com/toradora-shonen-tropes/