The five most popular questions about the content of Bet Season 1, excluding the overall plot and ending, are:

1. Who is Yumeko and what motivates her gambling at St. Dominic's Prep?
2. How does the gambling system at St. Dominic's work, including the roles of the Student Council and 'House Pets'?
3. What is the significance of the Student Council and how do they control the school?
4. How do the relationships and alliances between characters like Yumeko, Mary, Ryan, and Kira develop through the gambling matches?
5. What are some of the key gambling challenges or matches that define the season and the characters' standings?

These questions focus on the characters' motivations, the social and power structures within the school, and the specific gambling events that drive the story forward.