Bullet Train Transforming Robot Shinkalion The Animation

Hayato, who comes to Kyoto with his mother Sakura and his sister Haruka, reunites with his father, Hokuto, who is now working alone. It's been a long time since the family members' last reunion because Hokuto usually doesn't contact them at all. However, somehow Haruka's attitude toward Hokuto is strange. When Hayato asks why, Haruka replies a surprising answer. She suspects that Hokuto is cheating! (Source: Shinkalion Wiki)