Hmm, I think Shonan is going to be the first girl to have her heartbroken. Like, in any other harem rom-com, when the non-main girl is all giddy and excited at the start of a date with the mc, the mc is probably gonna reject her midway or towards the end as a 'sincere' response to her feelings. She then breaks down and maybe mona's lil bro gonna comfort her.