My father remarried, and it was his first family trip...

Since losing my mother before I could remember, I have been living alone with my father ever since. Despite my busy schedule, he took me on a hot spring trip every year, and the trip alone with my father was once a big annual event. However, this year's trip was different than usual... and my father's new wife, Mana, also ended up going with me. "Is it jealousy that my father was taken away? Is it a resistance to my new mother?" At the time, I was full of desire to kick my father's new wife out...