Yunika, a well‑known student at school, receives an invitation from her close friend Risa to study together at Risa"s house. Yunika worries that Risa"s older boyfriend, reputed to have boosted her grades significantly, might also show up. When she arrived at Risa"s later that day, Yunika saw Risa and her boyfriend enjoying themselves together in the evening and they seemed very happy.
