Honami and Ichika, Saki and Shiho were friends as children. The group used to stargaze and play music, but because of Saki's hospitalization during middle school, Honami's relationships with Ichika and Shiho became strained. Despite wanting to be friends with the two, she stopped speaking to them after her classmates would call her disloyal and speak rudely about Ichika and Shiho. After Saki returns to school and they access the School SEKAI, the group slowly reunites and forms Leo/need, named after the meteor shower they watched together as children. 

Honami is smart, athletic, and kind. She's said to be nice towards everyone and always takes their feelings into consideration, deeply caring for them. However, this can lead her to be indecisive and has difficulty expressing her own feelings, worrying that people may not like her for it. She doesn't want others to worry about her and tends to get emotional very easily. Despite this, she's always supportive of her friends, thinking of them very often; the moral of her character being "...when you try to be on everyone's side, you end up on no one's..." and that there is more than one form of kindness.

Mochizuki Honami's Introduction: https://www.youtube.com/watch?v=r-EU6cZf9gE