Tetsuo has offered to work with the girls to figure out how Hikari and Yuki, who don't handle heat or sunlight well, can spend summer in comfort. But the school's head teacher suggests that the demi girls' total reliance on Tetsuo might actually be hurting them in the long run. This weighs on Tetsuo's mind...
I hate to admit it, but it was 
mainly personal interest.
.أكره الاعتراف بهذا، لكنّه كان اهتمامًا خاصًّا محض
aus eigenem,
persönlichem Interesse.
Odio admitirlo,
pero era interés personal.
Odio admitirlo,
pero era interés personal.
et j’ai mis mes réserves de côté.
Per quanto odi ammetterlo,
l'ho fatto per interesse personale.
Odeio admitir, mas era 
interesse pessoal acima de tudo.
К моему стыду, просто из любопытства.