I think you should add bisexual as a tag as well instead of pansexual.
This is the difference between the two found on google
Bisexuality is at its core the attraction to two or more genders, while pansexuality is the attraction to all genders or regardless of gender. Polysexuality is the attraction to many, but not all genders. Pansexuality and bisexuality are similar, but not quite the same.
The reason I didn't use bisexuality is because Sakura himeno and Haruto are the mains. Sakura and himeno aren't really down with girls but Himeno has Sachiko's continued attraction to her an that plays heavy in the story.
Haruto doesn't see Mirai as a man nor is he attracted to Mirai because of him being one. Mirai was abused so much that he doesn't want to find a partner and only landed on haruto because his personality.
But since haruto loves Mirai for his personality it means he sees something more in Mirai besides gender(hence the pansexuality tag) and Mirai is definitely a boy, so i added the BL tag as to not shock the readers