@w33btr4sh
There's a few big ones.
• Irifune hangs out with Bambi, but pretty much doesn't give other guys the time of day, especially the guy who likes her.
• Back in chapter 10, she tries to get him to stay in school and cries when he turns her down harshly.
• When she says, "it's easy to turn your back to what's right in front of you," while standing right in front of him, it seemed like the subtext was their relationship.
• The black haired guy who likes Irifune also said it straight, "she likes him so much she just had to force him to stay."