Seiji was quite shaken by receiving such a direct confession and feeling her heartfelt words.
Kaho left after that. Seiji silently watched her leave. He was unable to continue trying to convince her to stop absorbing the demon energy.
It would be difficult for him to transfer the demon energy out of Kaho without her agreement.
Forcefully transferring it out of her would be highly dangerous. Plus, Seiji felt just how resolved Kaho was about this. He found it difficult to forcefully go against her wishes.
All he could do now was to let her older sister Karen know about the situation, along with telling Mika and Chiaki about this. He could only hope that the girls could convince Kaho to change her mind.
Although Seiji hoped for this, he felt that it was likely that Karen and the others would all fail in convincing Kaho.