Aijin - Itaihodo AishiteAijin - Itai Hodo Aishite; Aijin (WATANABE Shiho); Painfully in Love; 愛人~愛到心痛~; 愛人～痛いほど愛して～; 爱人~爱到心痛~

From Divine Sanctuary: A girl is falling in love with the most popular guy in school. But she's shy and doesn't know how to come closer to him. Is there any chance that they can become a couple...?